mpegts: add Reader, rewrite Writer

[aler9]

No description provided.

[codecov]

Codecov Report

Merging #23 (f8a9d2b) into main (29f0ee8) will decrease coverage by 1.27%.
The diff coverage is 70.45%.

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
- Coverage   89.10%   87.84%   -1.27%     
==========================================
  Files          34       40       +6     
  Lines        2717     2846     +129     
==========================================
+ Hits         2421     2500      +79     
- Misses        236      279      +43     
- Partials       60       67       +7     

Files Changed	Coverage Δ
pkg/formats/mpegts/opus_access_unit.go	0.00% <0.00%> (ø)
pkg/formats/mpegts/opus_control_header.go	0.00% <0.00%> (ø)
pkg/formats/mpegts/reader.go	46.78% <46.78%> (ø)
pkg/formats/mpegts/record_reader.go	66.66% <66.66%> (ø)
pkg/codecs/h264/annexb.go	89.69% <71.42%> (ø)
pkg/codecs/h264/avcc.go	92.30% <71.42%> (ø)
pkg/formats/mpegts/codec_h265.go	75.00% <75.00%> (ø)
pkg/formats/mpegts/track.go	75.00% <89.65%> (+4.41%)	⬆️
pkg/formats/mpegts/codec_opus.go	91.66% <91.66%> (ø)
pkg/formats/mpegts/writer.go	88.88% <94.11%> (+0.33%)	⬆️
... and 5 more

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