Fix focused publishing

[aringenbach]

This change:

• Fixes an issue around publishing the focused value within view update (i.e. Xcode runtime purple warning)
• Moves the library iOS requirement to iOS 15 (in order to use FocusState and remove the need of an external focused binding)
• Adds a UI test for toggling the focus state (i.e. simulates the interaction with a hosting app updating from outside)
• Revamps a bit how the buttons for debug actions of the example app work to save some place for debug AST / sent message, etc:

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +1.47% 🎉

Comparison is base (555d7f1) 88.38% compared to head (8749483) 89.86%.
Report is 11 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #761      +/-   ##
============================================
+ Coverage     88.38%   89.86%   +1.47%     
============================================
  Files           150      113      -37     
  Lines         17638    16222    -1416     
  Branches        836      606     -230     
============================================
- Hits          15590    14578    -1012     
+ Misses         1841     1624     -217     
+ Partials        207       20     -187     

Flag	Coverage Δ
uitests	80.51% <100.00%> (+5.39%)	⬆️
uitests-android	?
uitests-ios	80.51% <100.00%> (-0.13%)	⬇️
unittests	88.55% <0.00%> (+1.01%)	⬆️
unittests-android	?
unittests-ios	76.25% <0.00%> (+0.74%)	⬆️
unittests-rust	89.83% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
...ents/WysiwygComposerView/WysiwygComposerView.swift	76.85% <100.00%> (-1.82%)	⬇️

... and 37 files with indirect coverage changes

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[alfogrillo]

LGTM