Add WebRTC stream support (WHEP signaling)

[bhjelstrom]

• Adds whepcontroller
• Works across platforms including web
• Publisher determines stream type priority. The first stream type in the list is the "priority" stream type in automatic mode.
• Users can force a connection to particular stream in the camera stream widget properties window.
• Add stream type display name to the bottom of the camera stream widget
• The formatting does not perfectly match just yet.

In-motion, medium detail image:

Hidden max-quality mode in LLOS:

[codecov]

Codecov Report

❌ Patch coverage is 48.73096% with 202 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.55%. Comparing base (4fb4bbd) to head (c082312).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
lib/widgets/whep.dart	36.22%	125 Missing ⚠️
.../widgets/nt_widgets/multi_topic/camera_stream.dart	47.28%	68 Missing ⚠️
lib/widgets/camera_stream_controller.dart	91.07%	5 Missing ⚠️
lib/widgets/mjpeg.dart	69.23%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #359      +/-   ##
==========================================
- Coverage   78.61%   77.55%   -1.07%     
==========================================
  Files          95       97       +2     
  Lines        9587     9891     +304     
==========================================
+ Hits         7537     7671     +134     
- Misses       2050     2220     +170     

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

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[Gold872]

Wow! Thanks for getting this working!

Is there currently anyway I can test this out myself locally?

As for the implementation, I would definitely want to clean up the WhepController part, in particular, superclass a generic CameraStreamController which MjpegController and WhepController implement so that way a lot of the connection/disconnection logic can be re-used between stream types. If you want to try restructuring this feel free to, but you've already done a huge amount of the heavy lifting for this.

[bhjelstrom]

Nice, I see you have implemented the changes you wanted to see. I'll send a camera for local testing. Thanks again