Add Tuya Gas Sensor _TZE204_uo8qcagc variant

[kastakhov]

Proposed change

Adds Tuya explosive gas detectors:

_TZE204_uo8qcagc

Additional information

Closes: #4162

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

[Copilot]

Pull request overview

This PR adds support for a new variant of Tuya gas sensor (_TZE204_uo8qcagc). The quirk extends the base Tuya gas alarm configuration with three additional entities: a preheat status indicator, a fault alarm sensor, and an alarm control switch.

Changes:

• Added quirk definition for _TZE204_uo8qcagc gas sensor with specific data point mappings
• Added test coverage for the new device variant

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
zhaquirks/tuya/tuya_gas.py	Added QuirkBuilder configuration for the new gas sensor variant with three custom entities (preheat sensor, fault alarm, and alarm switch)
tests/test_tuya_gas.py	Added test case entry for the new device model to verify gas detection functionality

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.32%. Comparing base (40b41de) to head (b6b3b65).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #4684   +/-   ##
=======================================
  Coverage   92.32%   92.32%           
=======================================
  Files         371      371           
  Lines       12190    12191    +1     
=======================================
+ Hits        11254    11255    +1     
  Misses        936      936           

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[kastakhov]

Hi @puddly, @TheJulianJES, could you check this PR?

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.