Define IDL for initialize non transferable mint instruction

[lorisleiva]

The initialize non transferable mint instruction still needs to be defined in the idl.json file for it to be generated in the various clients.

The issue is a request to perform the following actions:

• Define the initialize non transferable mint instruction in the idl.json file. See how the program defines it to access that information.
• Run pnpm generate.
• Add at least one test for this instruction by following the same structure as the existing tests.
• When applicable, add the instruction in the getInitializeInstructionsForExtensions.ts helpers. This is only relevant if the instruction is used to initialize an extension in a mint or token account.

Here are some related PRs to get some inspiration from:

• Confidential transfer (Mint and token extension)
• Default account state (Mint extension)
• Metadata Pointer (Mint extension)
• Memo transfer (Token extension)