feat: sync edited messages

[boxdot]

This allows to send message edits and in particular syncs them when
using multi-device.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 16.89%. Comparing base (a2e7540) to head (e8f9f8b).
Report is 93 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #312      +/-   ##
==========================================
- Coverage   17.12%   16.89%   -0.23%     
==========================================
  Files          38       39       +1     
  Lines        3078     3107      +29     
==========================================
- Hits          527      525       -2     
- Misses       2551     2582      +31     

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[direc85]

As long as we're allowed to send combo edit+data message, LGTM! I can't test this myself though until next week.

We're breaking the API with returning a Vec but it's better to have it this way.