Add ConsistencyLevel and Executor

src/interfaces/ICustomConsistencyLevel.sol

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+// SPDX-License-Identifier: Apache 2
+pragma solidity ^0.8.0;
+
+//from https://github.com/wormhole-foundation/wormhole/blob/39081fa2936badf178f8b7e5eb63074d3308bf7d/ethereum/contracts/custom_consistency_level/interfaces/ICustomConsistencyLevel.sol
+interface ICustomConsistencyLevel {
+    //topic0 0xa37f0112e03d41de27266c1680238ff1548c0441ad1e73c82917c000eefdd5ea.
+    event ConfigSet(address emitterAddress, bytes32 config);
+
+    function configure(bytes32 config) external;
+
+    function getConfiguration(address emitterAddress) external returns (bytes32);
+}

src/interfaces/executor/IExecutor.sol

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+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.0;
+
+//from https://github.com/wormholelabs-xyz/example-messaging-executor/blob/ec5daea3c03f8860a62c23e28db5c6dc8771a9ce/evm/src/interfaces/IExecutor.sol
+interface IExecutor {
+    struct SignedQuoteHeader {
+        bytes4 prefix;
+        address quoterAddress;
+        bytes32 payeeAddress;
+        uint16 srcChain;
+        uint16 dstChain;
+        uint64 expiryTime;
+    }
+
+    event RequestForExecution(
+        address indexed quoterAddress,
+        uint256 amtPaid,
+        uint16 dstChain,
+        bytes32 dstAddr,
+        address refundAddr,
+        bytes signedQuote,
+        bytes requestBytes,
+        bytes relayInstructions
+    );
+
+    function requestExecution(
+        uint16 dstChain,
+        bytes32 dstAddr,
+        address refundAddr,
+        bytes calldata signedQuote,
+        bytes calldata requestBytes,
+        bytes calldata relayInstructions
+    ) external payable;
+}

src/interfaces/executor/IVaaV1Receiver.sol

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+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.0;
+
+//from https://github.com/wormholelabs-xyz/example-messaging-executor/blob/ec5daea3c03f8860a62c23e28db5c6dc8771a9ce/evm/src/interfaces/IVaaV1Receiver.sol
+//any contract that wishes to receive V1 VAAs from the executor needs to implement `IVaaV1Receiver`.
+interface IVaaV1Receiver {
+    function executeVAAv1(bytes memory msg) external payable;
+}

src/libraries/ConsistencyConfigMaker.sol

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+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.0;
+
+//from https://github.com/wormhole-foundation/wormhole/blob/39081fa2936badf178f8b7e5eb63074d3308bf7d/ethereum/contracts/custom_consistency_level/libraries/ConfigMakers.sol
+library ConsistencyConfigMaker {
+    uint8 public constant TYPE_ADDITIONAL_BLOCKS = 1;
+
+    //blocksToWait specifies the number of additional blocks to wait after the consistency level is reached.
+    function makeAdditionalBlocksConfig(uint8 consistencyLevel, uint16 blocksToWait)
+        internal
+        pure
+        returns (bytes32)
+    {
+        return bytes32((((
+          uint256(TYPE_ADDITIONAL_BLOCKS)
+          << 8) | uint256(consistencyLevel))
+          << 16) | uint256(blocksToWait))
+          << 224;
+    }
+}

src/libraries/executor/ExecutorMessages.sol

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+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.19;
+
+//from https://github.com/wormholelabs-xyz/example-messaging-executor/blob/ec5daea3c03f8860a62c23e28db5c6dc8771a9ce/evm/src/libraries/ExecutorMessages.sol
+library ExecutorMessages {
+    bytes4 private constant REQ_VAA_V1 = "ERV1";
+    bytes4 private constant REQ_NTT_V1 = "ERN1";
+    bytes4 private constant REQ_CCTP_V1 = "ERC1";
+    bytes4 private constant REQ_CCTP_V2 = "ERC2";
+
+    //selector 492f620d.
+    error PayloadTooLarge();
+
+    function makeVAAv1Request(uint16 emitterChain, bytes32 emitterAddress, uint64 sequence)
+        internal
+        pure
+        returns (bytes memory)
+    {
+        return abi.encodePacked(REQ_VAA_V1, emitterChain, emitterAddress, sequence);
+    }
+
+    //messageId specifies the manager message id for the NTT transfer.
+    function makeNTTv1Request(uint16 srcChain, bytes32 srcManager, bytes32 messageId)
+        internal
+        pure
+        returns (bytes memory)
+    {
+        return abi.encodePacked(REQ_NTT_V1, srcChain, srcManager, messageId);
+    }
+
+    function makeCCTPv1Request(uint32 sourceDomain, uint64 nonce) internal pure returns (bytes memory) {
+        return abi.encodePacked(REQ_CCTP_V1, sourceDomain, nonce);
+    }
+
+    //this request currently assumes the Executor will auto detect the event off chain.
+    //that may change in the future, in which case this interface would change.
+    function makeCCTPv2Request() internal pure returns (bytes memory) {
+        return abi.encodePacked(REQ_CCTP_V2, uint8(1));
+    }
+}

src/libraries/executor/RelayInstructions.sol

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+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.19;
+
+//from https://github.com/wormholelabs-xyz/example-messaging-executor/blob/ec5daea3c03f8860a62c23e28db5c6dc8771a9ce/evm/src/libraries/RelayInstructions.sol
+library RelayInstructions {
+    uint8 private constant RECV_INST_TYPE_GAS = uint8(1);
+    uint8 private constant RECV_INST_TYPE_DROP_OFF = uint8(2);
+
+    //this instruction may be specified more than once. If so, the relayer should sum the values.
+    function encodeGas(uint128 gasLimit, uint128 msgVal) internal pure returns (bytes memory) {
+        return abi.encodePacked(RECV_INST_TYPE_GAS, gasLimit, msgVal);
+    }
+
+    function encodeGasDropOffInstructions(uint128 dropOff, bytes32 recipient) internal pure returns (bytes memory) {
+        return abi.encodePacked(RECV_INST_TYPE_DROP_OFF, dropOff, recipient);
+    }
+}

test/CustomConsistencyLevel.t.sol

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+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.0;
+
+import {Test, console} from "forge-std/Test.sol";
+import {CONSISTENCY_LEVEL_SAFE} from "../src/constants/ConsistencyLevel.sol";
+import {ConsistencyConfigMaker} from "../src/libraries/ConsistencyConfigMaker.sol";
+
+//from https://github.com/wormhole-foundation/wormhole/blob/39081fa2936badf178f8b7e5eb63074d3308bf7d/ethereum/forge-test/CustomConsistencyLevel.t.sol
+contract CustomConsistencyLevelTest is Test {
+    function test_makeAdditionalBlocksConfig() public {
+        bytes32 expected = 0x01c9002a00000000000000000000000000000000000000000000000000000000;
+        bytes32 result = ConsistencyConfigMaker.makeAdditionalBlocksConfig(CONSISTENCY_LEVEL_SAFE, 42);
+        assertEq(expected, result);
+    }
+}

test/executor/ExecutorMessages.t.sol

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+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.13;
+
+import {Test, console} from "forge-std/Test.sol";
+import {ExecutorMessages} from "../../src/libraries/executor/ExecutorMessages.sol";
+
+//from https://github.com/wormholelabs-xyz/example-messaging-executor/blob/ec5daea3c03f8860a62c23e28db5c6dc8771a9ce/evm/test/ExecutorMessages.t.sol
+contract ExecutorMessagesTest is Test {
+    function test_makeVAAv1Request() public {
+        uint16 emitterChain = 7;
+        bytes32 emitterAddress = bytes32(uint256(uint160(0xdeadbeef)));
+        bytes memory expected = abi.encodePacked("ERV1", emitterChain, emitterAddress, uint64(42));
+        bytes memory buf = ExecutorMessages.makeVAAv1Request(emitterChain, emitterAddress, 42);
+        assertEq(expected, buf);
+    }
+
+    function test_makeNTTv1Request() public {
+        uint16 srcChain = 7;
+        bytes32 srcManager = bytes32(uint256(uint160(0xdeadbeef)));
+        bytes32 messageId = bytes32(uint256(42));
+        bytes memory expected = abi.encodePacked("ERN1", srcChain, srcManager, messageId);
+        bytes memory buf = ExecutorMessages.makeNTTv1Request(srcChain, srcManager, messageId);
+        assertEq(expected, buf);
+    }
+
+    function test_makeCCTPv1Request() public {
+        uint32 srcDomain = 7;
+        uint64 nonce = 42;
+        bytes memory expected = abi.encodePacked("ERC1", srcDomain, nonce);
+        bytes memory buf = ExecutorMessages.makeCCTPv1Request(srcDomain, nonce);
+        assertEq(expected, buf);
+    }
+
+    function test_makeCCTPv2Request() public {
+        bytes memory expected = abi.encodePacked("ERC2", uint8(1));
+        bytes memory buf = ExecutorMessages.makeCCTPv2Request();
+        assertEq(expected, buf);
+    }
+}

test/executor/RelayInstructions.t.sol

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+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.13;
+
+import {Test, console} from "forge-std/Test.sol";
+import {RelayInstructions} from "../../src/libraries/executor/RelayInstructions.sol";
+
+//from https://github.com/wormholelabs-xyz/example-messaging-executor/blob/ec5daea3c03f8860a62c23e28db5c6dc8771a9ce/evm/test/RelayInstructions.t.sol
+contract RelayInstructionsTest is Test {
+    function test_encodeGas() public {
+        uint128 gasLimit = 123456000;
+        uint128 msgVal = 42000;
+        bytes memory expected = abi.encodePacked(uint8(1), gasLimit, msgVal);
+        bytes memory buf = RelayInstructions.encodeGas(gasLimit, msgVal);
+        assertEq(expected, buf);
+    }
+
+    function test_encodeGasDropOffInstructions() public {
+        uint128 dropOff = 123456000;
+        bytes32 recipient = bytes32(uint256(uint160(0xdeadbeef)));
+        bytes memory expected = abi.encodePacked(uint8(2), dropOff, recipient);
+        bytes memory buf = RelayInstructions.encodeGasDropOffInstructions(dropOff, recipient);
+        assertEq(expected, buf);
+    }
+
+    function test_multipleInstructions() public {
+        uint128 gasLimit = 123456000;
+        uint128 msgVal = 42000;
+        uint128 dropOff = 123456000;
+        bytes32 recipient = bytes32(uint256(uint160(0xdeadbeef)));
+        bytes memory expected = abi.encodePacked(uint8(1), gasLimit, msgVal, uint8(2), dropOff, recipient);
+        bytes memory buf = abi.encodePacked(
+            RelayInstructions.encodeGas(gasLimit, msgVal),
+            RelayInstructions.encodeGasDropOffInstructions(dropOff, recipient)
+        );
+        assertEq(expected, buf);
+    }
+}