Rename variable matrix to ledMatrixAnimationHandler

[fabik111]

This PR fixes the clashing issue with the variable matrix of UNO R4

[pennam]

let's wait for CI and

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.04%. Comparing base (b349c5d) to head (9c50c4a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #12   +/-   ##
=======================================
  Coverage   90.04%   90.04%           
=======================================
  Files           7        7           
  Lines         713      713           
  Branches       86       86           
=======================================
  Hits          642      642           
  Misses         71       71           

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