Filter packets and reports by SSRC

[mengelbart]

Otherwise, we would record packets and reports which do not belong to the stream that is monitored by this recorder.

Reference issue

Fixes #166 #168

[codecov]

Codecov Report

Patch coverage: 88.00% and project coverage change: +0.54 🎉

Comparison is base (71346d6) 78.95% compared to head (531eebf) 79.49%.

❗ Current head 531eebf differs from pull request most recent head 1e0e0ad. Consider uploading reports for the commit 1e0e0ad to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
+ Coverage   78.95%   79.49%   +0.54%     
==========================================
  Files          66       66              
  Lines        3321     3350      +29     
==========================================
+ Hits         2622     2663      +41     
+ Misses        579      570       -9     
+ Partials      120      117       -3     

Flag	Coverage Δ
go	79.49% <88.00%> (+0.54%)	⬆️
wasm	77.07% <88.00%> (+0.13%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/stats/stats_recorder.go	84.51% <88.00%> (+4.04%)	⬆️

... and 2 files with indirect coverage changes

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