playback: add /list endpoint to list available timespans

[aler9]

No description provided.

[codecov]

Codecov Report

Attention: 133 lines in your changes are missing coverage. Please review.

Comparison is base (4553fc2) 51.93% compared to head (4bbc057) 51.96%.

Files	Patch %	Lines
internal/playback/fmp4.go	46.54%	56 Missing and 29 partials ⚠️
internal/playback/segment.go	73.39%	20 Missing and 9 partials ⚠️
internal/playback/server.go	51.28%	15 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2978      +/-   ##
==========================================
+ Coverage   51.93%   51.96%   +0.03%     
==========================================
  Files         130      131       +1     
  Lines       12624    12875     +251     
==========================================
+ Hits         6556     6691     +135     
- Misses       5575     5654      +79     
- Partials      493      530      +37     

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[github-actions]

This issue is mentioned in release v1.5.1 🚀
Check out the entire changelog by clicking here