rtmp: move implementation to gortmplib

[aler9]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.74%. Comparing base (e8b746b) to head (bc6f43b).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/protocols/rtmp/to_stream.go	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4968      +/-   ##
==========================================
- Coverage   56.65%   52.74%   -3.92%     
==========================================
  Files         215      162      -53     
  Lines       23575    18855    -4720     
==========================================
- Hits        13357     9945    -3412     
+ Misses       9236     8208    -1028     
+ Partials      982      702     -280     

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[github-actions]

This issue is mentioned in release v1.15.0 🚀
Check out the entire changelog by clicking here