Add Philips Hue Flux Gradient lightstrip

[FedeltaMedia]

Philips has added a new Hue Flux Gradient lightstrip

Proposed change

Add support for for 'multicolor' using PhilipsHueLightCluster for the new Philips Hue Flux Gradient lightstrip

Additional information

Device diagnostics

zha-07612e9e757e2fb0fa90d82e3c089c6d-Philips Hue Flux Gradient lightstrip-d65fcf00044ceb0b6a43a8f0de0bf373.json

Checklist

• The changes are tested and work correctly
• pre-commit checks pass / the code has been formatted using Black
• Tests have been added to verify that the new code works
• Device diagnostics data has been attached

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.19%. Comparing base (500e74e) to head (41cbf79).
⚠️ Report is 19 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #4392      +/-   ##
==========================================
+ Coverage   92.12%   92.19%   +0.06%     
==========================================
  Files         358      366       +8     
  Lines       11917    12013      +96     
==========================================
+ Hits        10979    11075      +96     
  Misses        938      938              

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[TheJulianJES]

Thanks!