Add comprehensive Solana transaction parsing capabilities via WASM,
providing types and structures compatible with BitGoJS's sdk-coin-sol.

## Rust Layer

### Transaction Deserialization (src/transaction.rs)
- Deserialize legacy Solana transactions from wire format
- Extract fee payer, blockhash, signatures, and account keys
- Provide signable payload for signing operations

### Instruction Decoding (src/instructions/)
- Decode System Program: Transfer, CreateAccount, NonceAdvance, NonceInitialize
- Decode Stake Program: Initialize, Delegate, Deactivate, Withdraw, Authorize
- Decode ComputeBudget: SetComputeUnitLimit, SetComputeUnitPrice
- Decode SPL Token: TransferChecked via token and token-2022 programs
- Decode ATA Program: CreateAssociatedTokenAccount, CloseAccount
- Decode Memo Program
- Unknown instruction fallback with raw data preservation

### High-Level Parser (src/parser.rs)
- Combine CreateAccount + NonceInitialize into CreateNonceAccount
- Combine CreateAccount + StakeInitialize + DelegateStake into StakingActivate
- Detect durable nonce transactions and populate durableNonce field
- Add stakingType field (NATIVE, JITO, MARINADE) to StakingActivate

### WASM Bindings (src/wasm/)
- ParserNamespace::parse_transaction - returns ParsedTransaction as JsValue
- TransactionNamespace - transaction inspection methods

## TypeScript Layer

### Transaction Wrapper (js/transaction.ts)
- Transaction class wrapping WASM with typed methods
- Access to fee payer, blockhash, signatures, instructions, account keys

### Parser Types (js/parser.ts)
- Full TypeScript interfaces matching BitGoJS InstructionParams
- ParsedTransaction interface with feePayer, nonce, durableNonce, instructionsData
- parseTransaction() function with BigInt conversion for SetPriorityFee.fee

### Exports (js/index.ts)
- Export Transaction class and parseTransaction function
- Re-export all instruction parameter types

## Tests
- BitGoJS compatibility tests using actual transaction fixtures
- Transaction deserialization and inspection tests
- Parser instruction type discrimination tests

TICKET: BTC-2929