Fixes #3050 - Sync mute state between ElementCall and CallKit

[stefanceriu]

• listen to changes in the mute state and sync up the CallKit controls with ElementCall and back
• rewrite how we construct and pass custom messages between the ElementCall widget and the widget driver

callkit.mov

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 67 lines in your changes missing coverage. Please review.

Project coverage is 77.45%. Comparing base (cdaa88e) to head (1f68fe5).
Report is 4 commits behind head on develop.

Files	Patch %	Lines
...urces/Screens/CallScreen/CallScreenViewModel.swift	0.00%	37 Missing ⚠️
...Services/ElementCall/ElementCallWidgetDriver.swift	0.00%	21 Missing ⚠️
...rces/Services/ElementCall/ElementCallService.swift	0.00%	8 Missing ⚠️
ElementX/Sources/Application/AppCoordinator.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3120      +/-   ##
===========================================
- Coverage    77.80%   77.45%   -0.35%     
===========================================
  Files          713      714       +1     
  Lines        54994    55786     +792     
===========================================
+ Hits         42786    43211     +425     
- Misses       12208    12575     +367     

Flag	Coverage Δ
unittests	68.24% <0.00%> (-0.06%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Velin92]

just a small suggestion, the rest LGTM

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud