Use Existing Handler Classes

[maxxfrazer]

Release Version: 2.1.0

Release Notes

• Moved extra delegates to AgoraSettings (same as iOS)
• Using existing handlers, rather than defining new class
• Updated various dependencies and Kotlin versions

Pull request checklist

Please check if your PR fulfills the following requirements:

• [x] Tests for the changes have been added (for bug fixes / features)
• [ ] The GitHub Actions pass building and linting. Linter returns no warnings or errors.
• [ ] The QA checklist below has been completed

Pull request type

Please check the type of change your PR introduces: - [x] Code style update (formatting, renaming) ## Does this introduce a breaking change? - [x] No

QA Checklist

UIKit Update Checklist (Minor or Patch Release)

• [x] Updated version number in agorauikit_android/build.gradle.kts
• [x] Using the latest version of Agora's Video SDK
• [x] Example apps are all functional
• [x] Core features are still working (both ways across platforms)
  • [x] Camera + Mic muting works for local and remote users
  • [x] Users are added and removed correctly when they join and leave the channel
  • [x] Older versions of the library gracefully handle changes (Create issue if not)
  • [x] Builtin buttons all work as expected
• [x] Any newly deprecated methods are flagged as such inline and in documentation