playback: improve /list performance (#3663)

[aler9]

Replaces #3663

Segments are now parsed in parallel.

[codecov]

Codecov Report

Attention: Patch coverage is 80.82192% with 14 lines in your changes missing coverage. Please review.

Project coverage is 56.16%. Comparing base (ac0ddc9) to head (a8ee1fb).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/playback/on_list.go	79.41%	9 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4102      +/-   ##
==========================================
+ Coverage   56.11%   56.16%   +0.05%     
==========================================
  Files         199      199              
  Lines       20539    20567      +28     
==========================================
+ Hits        11525    11552      +27     
  Misses       8144     8144              
- Partials      870      871       +1     

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[github-actions]

This issue is mentioned in release v1.11.0 🚀
Check out the entire changelog by clicking here