mpegts: add Writer.WriteOpus()

[aler9]

No description provided.

[codecov]

Codecov Report

Merging #26 (99a7be9) into main (103112d) will increase coverage by 2.21%.
Report is 1 commits behind head on main.
The diff coverage is 92.19%.

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   87.84%   90.05%   +2.21%     
==========================================
  Files          40       40              
  Lines        2846     2966     +120     
==========================================
+ Hits         2500     2671     +171     
+ Misses        279      222      -57     
- Partials       67       73       +6     

Files Changed	Coverage Δ
pkg/formats/mpegts/opus_access_unit.go	53.84% <50.00%> (+53.84%)	⬆️
pkg/formats/mpegts/writer.go	90.34% <93.47%> (+1.45%)	⬆️
pkg/formats/mpegts/opus_control_header.go	97.39% <100.00%> (+97.39%)	⬆️

... and 2 files with indirect coverage changes

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