fix: sui ITS mint_burn script & custom token linking

[blockchainguyy]

why?

• Use different strategies for lock_unlock & mint_burn manager modes
• Separate GMP calls for register coin metadata and link token to prevent failures

how?

• For non-origin tokens or lock_unlock mode, mint new coins using TreasuryCap
• For origin tokens with mint_burn mode, use coins from the client/deployer wallet (first combine coins if they are splitted)

testing

• Comprehensive testing is already completed

---

Note

Overhauls Sui ITS scripts by separating coin metadata registration from linking, adding salt and gas-fee handling, improving mint_burn origin flow, updating docs, and switching the Sui testnet RPC.

• Sui CLI/ITS:
  • New command: register-coin-metadata to register coin metadata on Axelar Hub.
  • Linking refactor: link-coin now links existing coins (no name/decimals), supports --tokenManagerMode, optional --salt, --registered, and --destinationOperator; validates inputs; encodes params with TextEncoder; pays gas using estimateITSFee.
  • Custom coin registration: register-custom-coin and give-unlinked-coin accept --salt; validation added; persist saltAddress and tokenManagerType in saved config.
  • Gas payment: GMP messages (register-coin-metadata, link-coin) now split gas coins and call gas_service::pay_gas with estimateITSFee.
• Example script (sui/its-example.js):
  • For origin tokens with mint_burn, use existing wallet coins (merge/split) instead of minting; default tokenManagerMode saved per token.
• Utils:
  • registerCustomCoinUtil supports fixed salt; createSaltAddress made configurable; saveTokenDeployment records tokenManagerType; minor payload cleanup in estimateITSFee call site.
• Docs (releases/sui/2025-09-ITS-v1.2.0.md):
  • Substantial edits: clearer steps, admin caps table, updated commands/examples, detailed custom token linking workflows.
• Config:
  • Update chains.sui.rpc to https://sui-testnet-rpc.publicnode.com.

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