feat(solana): implement SVM Entropy contract with V2 API

- Create new pyth-entropy Solana program using Anchor framework
- Implement V2 variants of Entropy contract methods from Ethereum version
- Add account structures for EntropyConfig, ProviderInfo, and EntropyRequest
- Include provider registration, randomness requests, and reveal functionality
- Support callback mechanisms and fee management
- Follow existing workspace patterns and dependencies

Refs: target_chains/ethereum/contracts/contracts/entropy/Entropy.sol
Co-Authored-By: Jayant <[email protected]>

Author: devin-ai-integration[bot]

target_chains/solana/Cargo.toml

@@ -1,6 +1,7 @@
 [workspace]
 members = [
     "programs/*",
+    "programs/pyth-entropy",
     "cli/",
     "program_simulator/",
     "pyth_solana_receiver_sdk/",

target_chains/solana/programs/pyth-entropy/Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "pyth-entropy"
+version = "0.1.0"
+description = "Pyth Entropy - Secure randomness provider for Solana"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "lib"]
+name = "pyth_entropy"
+
+[features]
+no-entrypoint = []
+no-idl = []
+no-log-ix-name = []
+cpi = ["no-entrypoint"]
+test-bpf = []
+
+[dependencies]
+anchor-lang = { workspace = true }
+solana-program = { workspace = true }
+byteorder = "1.4.3"
+rand = "0.8.5"

target_chains/solana/programs/pyth-entropy/Xargo.toml

@@ -0,0 +1,2 @@
+[target.bpfel-unknown-unknown.dependencies.std]
+features = []

target_chains/solana/programs/pyth-entropy/src/error.rs

@@ -0,0 +1,52 @@
+use anchor_lang::prelude::*;
+
+#[error_code]
+pub enum EntropyError {
+    #[msg("Provider not found")]
+    NoSuchProvider,
+    
+    #[msg("Request not found")]
+    NoSuchRequest,
+    
+    #[msg("Insufficient fee provided")]
+    InsufficientFee,
+    
+    #[msg("Provider is out of randomness")]
+    OutOfRandomness,
+    
+    #[msg("Incorrect revelation provided")]
+    IncorrectRevelation,
+    
+    #[msg("Unauthorized access")]
+    Unauthorized,
+    
+    #[msg("Invalid reveal call")]
+    InvalidRevealCall,
+    
+    #[msg("Assertion failure")]
+    AssertionFailure,
+    
+    #[msg("Update too old")]
+    UpdateTooOld,
+    
+    #[msg("Last revealed too old")]
+    LastRevealedTooOld,
+    
+    #[msg("Insufficient gas")]
+    InsufficientGas,
+    
+    #[msg("Max gas limit exceeded")]
+    MaxGasLimitExceeded,
+    
+    #[msg("Blockhash unavailable")]
+    BlockhashUnavailable,
+    
+    #[msg("Zero minimum signatures")]
+    ZeroMinimumSignatures,
+    
+    #[msg("Invalid guardian order")]
+    InvalidGuardianOrder,
+    
+    #[msg("Invalid guardian index")]
+    InvalidGuardianIndex,
+}