Implement support for Sui (SUI) blockchain (784) with encoding and decoding functions

[arbuthnot-eth]

This PR adds support for the Sui blockchain to the address-encoder library.

Summary

• Added Sui address encoding/decoding functionality
• Sui addresses are 32-byte values represented as a "0x" prefix followed by 64 lowercase hexadecimal characters
• No checksum validation is needed as per Sui's specification
• Added comprehensive test cases

Technical Details

• Coin Type: 784 (from SLIP-44)
• Address Format: 32-byte hex string with "0x" prefix
• Encoding: Convert 32 bytes to lowercase hex and prepend "0x"
• Decoding: Strip "0x" prefix and convert 64 hex chars to 32 bytes
• Validation: Regex pattern /^0x[a-f0-9]{64}$/ (case-insensitive input, lowercase output)

Files Added/Modified

• Added: src/coin/sui.ts - Sui address encoding/decoding functions
• Added: src/coin/sui.test.ts - Test cases for Sui addresses
• Modified: src/coders.ts - Added Sui export
• Modified: src/coins.ts - Added Sui to coins list
• Modified: src/consts/coinTypeToNameMap.ts - Added Sui to coin type mapping

References

• SLIP-44: https://github.com/satoshilabs/slips/blob/master/slip-0044.md
• Sui Documentation: https://docs.sui.io/concepts/cryptography/transaction-auth/keys-addresses
• Test vectors: https://github.com/MystenLabs/sui/tree/main/sdk/typescript/test/unit/cryptography

All tests are passing (1352 tests across 128 files).
Fixes #408