Improve HLS client

[aler9]

Fixes #1094

TODO:

• support fmp4 streams with video only
• start reading live streams from (end of playlist - starting point)
• support audio in separate playlist
• support fmp4 streams with video + audio
• support EXT-X-BYTERANGE
• synchronize stream reproduction around a leading track
• reset stream in case playback is too late
• add tests for everything

[codecov-commenter]

Codecov Report

Merging #1179 (68b6443) into main (847ca6c) will decrease coverage by 0.95%.
The diff coverage is 55.82%.

@@            Coverage Diff             @@
##             main    #1179      +/-   ##
==========================================
- Coverage   69.80%   68.84%   -0.96%     
==========================================
  Files         102      106       +4     
  Lines        8485     8847     +362     
==========================================
+ Hits         5923     6091     +168     
- Misses       2012     2194     +182     
- Partials      550      562      +12     

Impacted Files	Coverage Δ
internal/hls/client_processor_fmp4.go	0.00% <0.00%> (ø)
internal/hls/client_processor_fmp4_track.go	0.00% <0.00%> (ø)
internal/hls/mpegts/tracks.go	0.00% <0.00%> (ø)
internal/hls/mpegts/writer.go	90.38% <ø> (ø)
internal/hls/client_timesync_fmp4.go	34.48% <34.48%> (ø)
internal/hls/client_downloader_primary.go	40.86% <40.86%> (ø)
internal/hls/client_downloader_stream.go	47.48% <47.48%> (ø)
internal/hls/client_timesync_mpegts.go	60.00% <60.00%> (ø)
internal/hls/fmp4/init.go	63.33% <63.33%> (ø)
internal/hls/fmp4/part.go	67.37% <67.37%> (ø)
... and 14 more

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[aler9]

added in v0.20.1

[github-actions]

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