Buffer packets when no RTCP writer is set

[mengelbart]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 69.23077% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.39%. Comparing base (a0af02f) to head (57d89b5).

Files with missing lines	Patch %	Lines
pkg/twcc/sender_interceptor.go	53.84%	5 Missing and 1 partial ⚠️
pkg/rfc8888/interceptor.go	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #458      +/-   ##
==========================================
- Coverage   81.52%   81.39%   -0.14%     
==========================================
  Files          88       88              
  Lines        4656     4676      +20     
==========================================
+ Hits         3796     3806      +10     
- Misses        684      692       +8     
- Partials      176      178       +2     

Flag	Coverage Δ
go	81.39% <69.23%> (-0.14%)	⬇️

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