[JS] Add Scaled UI Amount Extension Support

[gitteri]

Add Scaled UI Amount Extension Support

This PR adds support for the Scaled UI Amount extension to the Token-2022 program, including IDL updates, generated client libraries, and tests. This is a prerequisite to being able to add additional helpers for the scaled ui amount extension.

Changes

IDL Updates

• Added ScaledUiAmountConfig extension to the IDL schema
• Added fields for:
  • authority: The account authorized to update the multiplier
  • multiplier: The current scaling multiplier
  • newMultiplier: The next multiplier to be applied
  • newMultiplierEffectiveTimestamp: When the new multiplier takes effect

Generated Client Libraries

• Added initializeScaledUiAmountMint instruction
• Added updateMultiplierScaledUiMint instruction
• Generated TypeScript types and codecs for the new extension

Tests

• Added test coverage for initializing a mint with scaled UI amount extension
• Added test coverage for updating the multiplier
• Verified extension state and multiplier updates work correctly

[lorisleiva]

Thanks! Looks like CI isn't passing because:

• It identifies some changes when running pnpm generate. The fix here is to run pnpm generate again locally and commit the changes.
• For some reason, the new generated code use @solana/web3.js instead of @solana/kit (renamed like 2 days ago). My hunch is that your local nodes_module still use an old version of Codama and doing pnpm install before generating should fix it.

[lorisleiva]

Perfect, thank you! 🍺