feat: Decode Swig Instructions

[santy311]

This PR introduces transaction decoding and simulation capabilities to the SWIG Rust SDK, enhancing the devex with better transaction visibility and debugging tools.

1. Transaction Decoder
   New decoder.rs module with comprehensive SWIG instruction decoding

• DecodedTransaction struct providing human-readable transaction information including:
• Instruction type identification (CreateSwig, AddAuthority, Sign, etc.)
• Role ID and authority type tracking
• InstructionType enum covering all SWIG operations:

2. Transaction Simulation

• Account balance tracking with AccountChange struct showing pre/post transaction states
• Balance change analysis for all accounts involved in transactions
• Account summary generation providing detailed balance impact information
• Integration with existing wallet functionality for seamless simulation workflow

[santy311]

cargo test should_decode_create_swig_instruction --features=rust_sdk_test -- --nocapture

[tracy-codes]

This looks great so far! I think if we can set the output type to be json or in something like a set of solana tranasction instructions struct types that we can then either base58 encode or base64 encode, that would take this to the next level here.

[santy311]

@tracy-codes I have added support for JSON outputs with a small hack in states crate

{
  "instruction_type": "Sign",
  "description": "Sign a transaction",
  "role_id": 0,
  "authority_type": "Ed25519",
  "data": null,
  "fee_payer": "Frtjd3aVM7A9HCP5VCkyjCn3KtBEhSDycY9t4Qs9ntTt",
  "account_summary": [
    {
      "account_id": "Frtjd3aVM7A9HCP5VCkyjCn3KtBEhSDycY9t4Qs9ntTt",
      "account_name": null,
      "pre_balance": 9998365280,
      "post_balance": 9998360280,
      "balance_change": -5000
    },
    {
      "account_id": "7JKfJaxbNSqvzMryvQMeAejxCR4odjHj1vh3Jxnuxgu8",
      "account_name": null,
      "pre_balance": 0,
      "post_balance": 100000000,
      "balance_change": 100000000
    },
    {
      "account_id": "Add51oQvYk863Rp35W4Hzv1Uk3GHLTnbn2tSuiFDoDJc",
      "account_name": null,
      "pre_balance": 10001614720,
      "post_balance": 9901614720,
      "balance_change": -100000000
    }
  ]
}