feat(llc): end-to-end encryption

[Brazol]

Part of FLU-171
Flutter Webrtc part - GetStream/webrtc-flutter#83
Docs - https://github.com/GetStream/docs-content/pull/1537

Adds end-to-end encryption to the Flutter SDK, backed by the native EncryptionManager in the flutter-webrtc (PR #110).

[coderabbitai]

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[codecov]

Codecov Report

❌ Patch coverage is 34.31085% with 224 lines in your changes missing coverage. Please review.
✅ Project coverage is 12.42%. Comparing base (e2bef6b) to head (f80a48a).

Files with missing lines	Patch %	Lines
...coordinator/model/encryption_settings_request.dart	3.27%	59 Missing ⚠️
...oordinator/model/encryption_settings_response.dart	29.68%	45 Missing ⚠️
...kages/stream_video/lib/src/webrtc/rtc_manager.dart	28.07%	41 Missing ⚠️
packages/stream_video/lib/src/call/call.dart	67.74%	20 Missing ⚠️
...ges/stream_video/lib/src/models/call_settings.dart	6.25%	15 Missing ⚠️
...video/lib/protobuf/video/sfu/models/models.pb.dart	0.00%	10 Missing ⚠️
...video/coordinator/model/call_settings_request.dart	0.00%	7 Missing ⚠️
...api/video/coordinator/model/join_call_request.dart	0.00%	7 Missing ⚠️
...tream_video/lib/src/call/session/call_session.dart	0.00%	6 Missing ⚠️
...ideo/coordinator/model/call_settings_response.dart	42.85%	4 Missing ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1312      +/-   ##
==========================================
+ Coverage   12.27%   12.42%   +0.15%     
==========================================
  Files         679      684       +5     
  Lines       50399    50747     +348     
==========================================
+ Hits         6184     6307     +123     
- Misses      44215    44440     +225     

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