[JS] Add Pausable Extension to IDL & TS client

[gitteri]

Add Pausable Extension to IDL, TypeScript Client, and Tests

Summary

This PR adds the Pausable extension to the Token-2022 ts library. It updates the IDL, generates the relevant TypeScript client code, and adds tests to ensure correct behavior for initializing, pausing, and resuming mints with the pausable extension.

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Changes

1. IDL Update

• Extended program/idl.json to include the PausableConfig extension, supporting new instructions for pausing and resuming mints.
• Adds required types for the generated ts client

2. TypeScript Generated Client Code

• Generated new instruction files:
  • initializePausableConfig.ts
  • pause.ts
  • resume.ts
• Updated:
  • index.ts to export new instructions.
  • programs/token2022.ts, types/extension.ts, and types/extensionType.ts to support the new extension.
  • getInitializeInstructionsForExtensions.ts to handle pausable config initialization.

3. Tests

• Added tests under clients/js/test/extensions/pausable/:
  • initializePausable.test.ts: Verifies mint initialization with the pausable extension.
  • pause.test.ts: Ensures a mint can be paused and the state is reflected on-chain.
  • resume.test.ts: Ensures a paused mint can be resumed and the state is updated accordingly.

[joncinque]

I mainly checked the IDL, and it looks great to me! A small nit on typing, which you can take or leave

[joncinque]

Technically, this is just a public key, but it shouldn't make a difference -- the program will fail if provided a None