token 2022: move update authority check to shared file

[buffalojoec]

This PR moves the check_update_authority function into its own module, for use across multiple extention processors.

[buffalojoec]

Current dependencies on/for this PR:

• master
  • PR token 2022: move update authority check to shared file #5595 👈
    • PR token metadata: replace IncorrectMintAuthority with TokenError::OwnerMismatch #5615
      • PR token 2022: add InitializeGroup instruction from SPL Token Group interface #5601

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[buffalojoec]

Note this will also be used by SPL Token Group's example program and extension.

[joncinque]

Just the one suggestion to move it elsewhere, otherwise it looks good!

[joncinque]

Can you move this up one directory into src directly? The extension directory mainly contains extensions (except for reallocate.rs), so I'm thinking to have this more directly available.

Or even better, it might make more sense to have this in token-metadata-interface, since both the example and token-2022 are using it, and it returns TokenMetadataError

[buffalojoec]

Ahh that's a good catch on the error type. What do you suggest about this error if I'm going to use it in the Token Group example? I'm almost thinking we do something like #5615...

Happy to move it to src either way.

[buffalojoec]

Scrapping this.