Give Tuya backlight values descriptive names

[IgorMilavec]

Proposed change

Tuya Backlight enum names are not descriptive. Users needed to search the Internet to get the meaning of each value.

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.85%. Comparing base (8124411) to head (4a1be52).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #3662   +/-   ##
=======================================
  Coverage   89.85%   89.85%           
=======================================
  Files         322      322           
  Lines       10379    10379           
=======================================
  Hits         9326     9326           
  Misses       1053     1053           

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