perf: avoid recreating enums from feature flags

[bdraco]

No description provided.

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (c4b110a) 40.47% compared to head (9d170d5) 40.47%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/bleak_esphome/backend/client.py	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #5   +/-   ##
=======================================
  Coverage   40.47%   40.47%           
=======================================
  Files           9        9           
  Lines         504      504           
  Branches       90       90           
=======================================
  Hits          204      204           
  Misses        298      298           
  Partials        2        2           

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