unify group call stream stuff into matrixRTCEventStream

[coder-with-a-bushido]

Closes https://github.com/famedly/product-management/issues/1950

[codecov]

Codecov Report

❌ Patch coverage is 68.29268% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.01%. Comparing base (e772d4d) to head (197c247).

Files with missing lines	Patch %	Lines
lib/src/voip/backend/mesh_backend.dart	62.96%	10 Missing ⚠️
lib/src/voip/models/matrixrtc_call_event.dart	81.81%	2 Missing ⚠️
lib/fake_matrix_api.dart	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2148      +/-   ##
==========================================
+ Coverage   55.44%   57.01%   +1.56%     
==========================================
  Files         148      148              
  Lines       19226    19267      +41     
==========================================
+ Hits        10660    10985     +325     
+ Misses       8566     8282     -284     

Files with missing lines	Coverage Δ
lib/src/voip/group_call_session.dart	78.50% <100.00%> (+15.07%)	⬆️
lib/src/voip/utils/types.dart	0.00% <ø> (ø)
lib/fake_matrix_api.dart	64.05% <50.00%> (-0.13%)	⬇️
lib/src/voip/models/matrixrtc_call_event.dart	86.66% <81.81%> (+11.66%)	⬆️
lib/src/voip/backend/mesh_backend.dart	67.57% <62.96%> (+41.05%)	⬆️

... and 4 files with indirect coverage changes

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[td-famedly]

lg

[td-famedly]

ah @coder-with-a-bushido can you also add some tests please?

stale