feat: add LED brightness control

[firstof9]

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[codecov]

Codecov Report

Attention: Patch coverage is 97.18310% with 2 lines in your changes missing coverage. Please review.

Project coverage is 86.43%. Comparing base (82a9782) to head (0302371).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
custom_components/openevse/__init__.py	77.77%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #404      +/-   ##
==========================================
+ Coverage   85.68%   86.43%   +0.75%     
==========================================
  Files          13       14       +1     
  Lines        1013     1084      +71     
==========================================
+ Hits          868      937      +69     
- Misses        145      147       +2     

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