client: move track-related code into track processor

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: 78 lines in your changes are missing coverage. Please review.

Comparison is base (6a554dd) 71.15% compared to head (0cbe727) 71.50%.

Files	Patch %	Lines
client_track_processor_fmp4.go	47.25%	41 Missing and 7 partials ⚠️
client_stream_processor_mpegts.go	78.94%	13 Missing and 3 partials ⚠️
client_track_processor_mpegts.go	73.33%	8 Missing and 4 partials ⚠️
client_stream_processor_fmp4.go	86.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #121      +/-   ##
==========================================
+ Coverage   71.15%   71.50%   +0.35%     
==========================================
  Files          42       43       +1     
  Lines        3598     3636      +38     
==========================================
+ Hits         2560     2600      +40     
+ Misses        838      833       -5     
- Partials      200      203       +3     

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