RCS fixes

[dragonmantank]

• Added some missing RCS config data
• Made TTL public so it can be set

Contribution Checklist

• Unit tests!
• Updated CHANGELOG.md
• My name is in CONTRIBUTORS.md

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.05%. Comparing base (cff1df0) to head (d34abf7).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #615      +/-   ##
============================================
+ Coverage     98.94%   99.05%   +0.11%     
- Complexity     3628     3643      +15     
============================================
  Files           545      548       +3     
  Lines          8019     8048      +29     
  Branches        444      444              
============================================
+ Hits           7934     7972      +38     
+ Misses           64       56       -8     
+ Partials         21       20       -1     

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[superchilled]

Looks good overall. Just one suggestion re the ttl bounds.

However, looking at the tests you added I did notice another issue. The trustedRecipient param should be a top-level param, not part of the rcs object (see the spec).

Would probably make sense to fix that as part of this same PR.