hls: support reading and proxying AV1 tracks

[aler9]

No description provided.

[codecov]

Codecov Report

Merging #2155 (5959d18) into main (b198cc5) will decrease coverage by 0.04%.
Report is 2 commits behind head on main.
The diff coverage is 11.42%.

@@            Coverage Diff             @@
##             main    #2155      +/-   ##
==========================================
- Coverage   61.45%   61.42%   -0.04%     
==========================================
  Files         113      112       -1     
  Lines       12616    12644      +28     
==========================================
+ Hits         7753     7766      +13     
- Misses       4302     4317      +15     
  Partials      561      561              

Files Changed	Coverage Δ
internal/core/hls_source.go	65.54% <0.00%> (ø)
internal/rtmp/reader.go	43.25% <0.00%> (ø)
internal/core/hls_muxer.go	53.37% <13.79%> (-2.84%)	⬇️

... and 4 files with indirect coverage changes

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