Integrate pixelflux and pcmflux into webrtc mode

[PMohanJ]

Reference the issue numbers and reviewers
@ehfd @thelamer

Explain relevant issues and how this pull request solves them
Integrates pixelflux and pcmflux for video and audio media capturing. These serve a potential drop-in replacement for gstreamer plugins.

Describe the changes in code and its dependencies and justify that they work as intended after testing

• Pixelflux and gstreamer pipeline exists for screen capturing, defaulting to pixelflux.
• Onboarded rtc monitoring logic for dynamic ICE configuration.
• Few bug fixes on client and server side related to gpu stats, UI side menu failing to rendering, etc

Describe alternatives you've considered
NA

Additional context
NA

• I confirm that this pull request is relevant to the scope of this project. If you know that upstream projects are the cause of this problem, please file the pull request there.
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