feat: add EIP-712 cheatcodes (#686)

Ref foundry-rs/foundry#10510

Add `eip712HashType`, `eip712HashStruct`, and `eip712HashTypedData`
cheatcodes to VmSafe interface

```solidity
function eip712HashType(string calldata typeNameOrDefinition) external pure returns (bytes32 typeHash);
function eip712HashType(string calldata bindingsPath, string calldata typeName) external pure returns (bytes32 typeHash);
function eip712HashStruct(string calldata typeNameOrDefinition, bytes calldata abiEncodedData) external pure returns (bytes32 typeHash);
function eip712HashStruct(string calldata bindingsPath, string calldata typeName, bytes calldata abiEncodedData) external pure returns (bytes32 typeHash);
function eip712HashTypedData(string calldata jsonData) external pure returns (bytes32 digest);
```

Author: yash-atreya

src/Vm.sol

@@ -13,6 +13,6 @@ contract VmTest is Test {
     }
 
     function test_VmSafeInterfaceId() public pure {
-        assertEq(type(VmSafe).interfaceId, bytes4(0x4d98a4ca), "VmSafe");
+        assertEq(type(VmSafe).interfaceId, bytes4(0x1b0ca4fb), "VmSafe");
     }
 }