Split out and retire the MiscellaneousClient

[SeanKilleen]

While working on #2571 to support #2474, I noticed the MiscellaneousClient had a link to misc rest endpoint that had since been separated into their own named endpoints and docs. The Octokit .NET client updated the URLs but didn't update the C# code to reflect them.

My suggestion, which I think can be done in steps:

• Method by method:
• Create named clients & methods to support the functionality within MiscellaneousClient
• Use those clients from within MiscellaneousClient to ensure no issues.
• Deprecate methods to ensure users know it's just a redirect.
• Deprecate MiscellaneousClient itself.
• Remove MiscellaneousClient in a future release.

Creating this issue per discussion with @nickfloyd at #2571 (comment)

[JonruAlveus]

❤️ I'd be happy to pick this one up.

[JonruAlveus]

Clients:

• EmojisClient
  • /emojis
• MarkdownClient
  • /markdown/raw
  • /markdown
• GitIgnoreClient
  • /gitignore/templates
  • /gitignore/templates/{name}
• LicensesClient
  • /licenses
  • /licenses/{key}
• RateLimitClient
  • /rate_limit
• MetaClient
  • /meta

[github-actions]

👋 Hey Friends, this issue has been automatically marked as stale because it has no recent activity. It will be closed if no further activity occurs. Please add the Status: Pinned label if you feel that this issue needs to remain open/active. Thank you for your contributions and help in keeping things tidy!