Add playlist support

[frenck]

Proposed Changes

Add support for the new Playlist features that land in WLED 0.13

[ghost]

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[codecov]

Codecov Report

Merging #359 (d141cc4) into main (4d7ef1c) will decrease coverage by 1.06%.
The diff coverage is 54.76%.

@@            Coverage Diff             @@
##             main     #359      +/-   ##
==========================================
- Coverage   65.22%   64.15%   -1.07%     
==========================================
  Files           4        4              
  Lines         417      452      +35     
  Branches       85       96      +11     
==========================================
+ Hits          272      290      +18     
- Misses        129      146      +17     
  Partials       16       16              

Impacted Files	Coverage Δ
src/wled/__init__.py	100.00% <ø> (ø)
src/wled/wled.py	50.96% <33.33%> (-1.52%)	⬇️
src/wled/models.py	74.57% <63.33%> (-1.76%)	⬇️

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