[RTC-117] Add padding packets metric

[mickel8]

No description provided.

[codecov]

Codecov Report

Merging #279 (648d234) into master (64a7b44) will decrease coverage by 0.09%.
The diff coverage is 28.57%.

@@            Coverage Diff             @@
##           master     #279      +/-   ##
==========================================
- Coverage   63.05%   62.97%   -0.09%     
==========================================
  Files          44       44              
  Lines        2125     2131       +6     
==========================================
+ Hits         1340     1342       +2     
- Misses        785      789       +4     

Impacted Files	Coverage Δ
lib/membrane_rtc_engine/metrics.ex	0.00% <ø> (ø)
...rane_rtc_engine/endpoints/webrtc/track_receiver.ex	49.47% <20.00%> (-1.08%)	⬇️
lib/membrane_rtc_engine/utils.ex	14.28% <50.00%> (+2.16%)	⬆️

... and 4 files with indirect coverage changes

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[LVala]

Branch is out of date and that might be why 5 out of 7 integration tests failed, code itself is 👍

Edit: or the new jammy membrane_docker image? idk

[mickel8]

Ehhh....