feat(sdk-coin-sol): add WASM-based transaction parsing via @bitgo/wasm-solana

[lcovar]

Adds WASM-based transaction parsing using @bitgo/wasm-solana package
with no @solana/web3.js dependency in the parsing path.

New Files

src/lib/wasm/transaction.ts

WasmTransaction class for parsing Solana transactions using WASM:

• Transaction ID extraction from signatures
• Signable payload generation
• JSON serialization with parsed instruction data
• Transaction explanation for human readability
• Token name resolution via BitGo statics

src/lib/wasmParsedInstructionCombiner.ts

Clean instruction combiner without @solana/web3.js dependency:

• Combines raw WASM-parsed instructions into BitGoJS InstructionParams
• Pattern matching for multi-instruction combinations:
  • CreateAccount + NonceInitialize → WalletInit
  • CreateAccount + StakeInitialize + Delegate → StakingActivate (Native)
  • CreateAccount + StakeInitialize → StakingActivate (Marinade)
  • StakePoolDepositSol → StakingActivate (Jito)
  • StakePoolWithdrawStake → StakingDeactivate (Jito)
• Derives transaction type from combined instructions
• Handles bigint to string conversion for amounts

src/lib/wasmInstructionCombiner.ts

Thin wrapper that orchestrates WASM instruction parsing:

1. Gets transaction bytes from WASM transaction
2. Parses with wasm-solana's parseTransaction()
3. Delegates to wasmParsedInstructionCombiner

Modified Files

src/sol.ts

• Added explainTransactionWithWasm() for WASM-based transaction explanation
• Integration with new WASM parsing layer

src/lib/instructionParamsFactory.ts

Fixed edge cases in staking instruction parsing:

• StakingAuthorize: support 4-key instructions (custodian optional)
• StakingAuthorizeRaw: support 2-3 instructions (one or both authorities)

Tests

• wasmTransaction.ts: Unit tests for WasmTransaction class
• jitoWasmVerification.ts: Jito staking WASM verification tests