fix: add `CustomCredentials` error class to extend from for custom `authorize()` error

[ndom91]

☕️ Reasoning

• Just an idea, but open to discussion..
• Adds a new CustomCredentials error class that is designed to be extended for the custom authorize() error functionality we recently shipped.
• The idea here is to avoid the custom suffixes we append to error.message with the CredentialsSignin error class which we're currently recommending people extend from.
  • See: https://github.com/nextauthjs/next-auth/pull/9871#issuecomment-1979842947

🧢 Checklist

• [ ] Documentation
• [ ] Tests
• [ ] Ready to be merged

🎫 Affected issues

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

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[MrOxMasTer]

If you create this class, don't forget to export it to next-auth immediately. Thanks

[MrOxMasTer]

Can you upload a new version of the package to npm after combining pull request with main?

[ndom91]

Replaced by: https://github.com/nextauthjs/next-auth/pull/11050