Decode streams once and only when needed

[aler9]

TODO:

• PTS synchronization
• restore logging of decode errors
• remove H264 re-encoding from gortsplib and move it here
• remove H264 decoding from gortsplib and move it here
• oversized tests

[codecov-commenter]

Codecov Report

Merging #1218 (1734426) into main (a4363df) will decrease coverage by 0.11%.
The diff coverage is 41.25%.

@@            Coverage Diff             @@
##             main    #1218      +/-   ##
==========================================
- Coverage   68.13%   68.01%   -0.12%     
==========================================
  Files         106      107       +1     
  Lines        8816     8874      +58     
==========================================
+ Hits         6007     6036      +29     
- Misses       2247     2270      +23     
- Partials      562      568       +6     

Impacted Files	Coverage Δ
internal/core/rpicamera_source.go	0.00% <0.00%> (ø)
internal/core/streamtrack_generic.go	0.00% <0.00%> (ø)
internal/hls/muxer_variant_fmp4_segmenter.go	73.84% <0.00%> (-0.77%)	⬇️
internal/core/streamtrack_mpeg4audio.go	33.33% <4.34%> (-11.12%)	⬇️
internal/core/hls_source.go	72.46% <20.00%> (-3.30%)	⬇️
internal/core/rtmp_source.go	71.92% <20.00%> (+0.75%)	⬆️
internal/core/data.go	33.33% <33.33%> (ø)
internal/core/rtsp_session.go	65.53% <35.29%> (-4.38%)	⬇️
internal/core/rtmp_conn.go	65.12% <37.77%> (-1.55%)	⬇️
internal/core/rtsp_source.go	71.55% <43.75%> (-4.45%)	⬇️
... and 11 more

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[github-actions]

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