add pmp4 package

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 72.94317% with 319 lines in your changes are missing coverage. Please review.

Project coverage is 83.06%. Comparing base (0b44f66) to head (b923549).

Files	Patch %	Lines
pkg/formats/pmp4/track.go	74.02%	179 Missing and 74 partials ⚠️
pkg/formats/pmp4/presentation.go	74.34%	26 Missing and 13 partials ⚠️
pkg/formats/pmp4/mp4_writer.go	49.05%	18 Missing and 9 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #125      +/-   ##
==========================================
- Coverage   85.14%   83.06%   -2.09%     
==========================================
  Files          72       75       +3     
  Lines        5737     6916    +1179     
==========================================
+ Hits         4885     5745     +860     
- Misses        630      853     +223     
- Partials      222      318      +96     

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