Buffer packets when no RTCP writer is set

[mengelbart]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.41%. Comparing base (33e6fc9) to head (fd7ae02).

Files with missing lines	Patch %	Lines
pkg/ccfb/interceptor.go	66.66%	3 Missing ⚠️
pkg/twcc/sender_interceptor.go	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #458      +/-   ##
==========================================
- Coverage   85.43%   85.41%   -0.03%     
==========================================
  Files          91       91              
  Lines        3976     3990      +14     
==========================================
+ Hits         3397     3408      +11     
- Misses        579      582       +3     

Flag	Coverage Δ
go	85.41% <77.77%> (-0.03%)	⬇️

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