Merge membrane_webrtc_plugin

[mickel8]

membrane_webrtc_plugin is not intended to be used outside membrane_rtc_engine as it is too tightly coupled to the webrtc endpoint.

Because of that, and because Membrane Team created a new membrane_webrtc_plugin that uses Elixir WebRTC under the hood and has a brand new API, we want to merge the old membrane_webrtc_plugin and release its name for the new Membrane's package.

New Membrane's plugin: https://github.com/membraneframework-labs/membrane_webrtc_plugin
Old Jellyfish plugin: https://github.com/jellyfish-dev/membrane_webrtc_plugin

[codecov]

Codecov Report

Merging #384 (1677afb) into master (5500016) will decrease coverage by 0.31%.
The diff coverage is 52.14%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #384      +/-   ##
==========================================
- Coverage   54.66%   54.36%   -0.31%     
==========================================
  Files          64       75      +11     
  Lines        2720     3254     +534     
==========================================
+ Hits         1487     1769     +282     
- Misses       1233     1485     +252     

Files	Coverage Δ
webrtc/lib/webrtc_endpoint.ex	0.00% <ø> (ø)
webrtc/lib/endpoint_bin/extension/mid.ex	83.33% <83.33%> (ø)
webrtc/lib/endpoint_bin/extension/rid.ex	83.33% <83.33%> (ø)
webrtc/lib/endpoint_bin/metrics.ex	0.00% <0.00%> (ø)
webrtc/lib/endpoint_bin/extension.ex	60.00% <60.00%> (ø)
webrtc/lib/endpoint_bin/extension/repaired_rid.ex	16.66% <16.66%> (ø)
webrtc/lib/endpoint_bin/extension/vad.ex	0.00% <0.00%> (ø)
webrtc/lib/endpoint_bin/extension/twcc.ex	0.00% <0.00%> (ø)
webrtc/lib/endpoint_bin/utils.ex	0.00% <0.00%> (ø)
webrtc/lib/endpoint_bin/track.ex	77.10% <77.10%> (ø)
... and 3 more

... and 4 files with indirect coverage changes

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[Rados13]

This PR is outdated compared to the master. You could rebase with master before merging this PR, but that is only a suggestion.