feat: added RCS channel and changes to other channels

[manchuck]

Description

Adding the RCS Channel and syncing up MMS and SMS Channels

Motivation and Context

Testing Details

Example Output or Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.52%. Comparing base (e12c0d0) to head (a443216).
Report is 17 commits behind head on 3.x.

❗ Current head a443216 differs from pull request most recent head 5a6a224

Please upload reports for the commit 5a6a224 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##              3.x     #941      +/-   ##
==========================================
+ Coverage   84.36%   84.52%   +0.15%     
==========================================
  Files         122      130       +8     
  Lines        1797     1867      +70     
  Branches      375      382       +7     
==========================================
+ Hits         1516     1578      +62     
- Misses        281      289       +8     

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[superchilled]

LGTM. Thanks for addressing the comments.