Filter incoming reports by SSRC

[mengelbart]

Description

Filtering reports by SSRC. Most important for Sender Reports, Receiver Reports, and Extended Reports. The others should be filtered earlier, but just to be sure, I also added a check for the correct MediaSSRCs of NACK, PLI, and FIR.

Reference issue

Fixes #419

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.09%. Comparing base (9f43161) to head (b75ece5).

Files with missing lines	Patch %	Lines
pkg/stats/stats_recorder.go	33.33%	5 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (33.33%) is below the target coverage (70.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #420      +/-   ##
==========================================
+ Coverage   80.07%   80.09%   +0.02%     
==========================================
  Files          88       88              
  Lines        4603     4608       +5     
==========================================
+ Hits         3686     3691       +5     
- Misses        734      735       +1     
+ Partials      183      182       -1     

Flag	Coverage Δ
go	80.09% <33.33%> (+0.02%)	⬆️

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