Add support for DIAGNOSTIC WriteAttributeButton entities

[jeverley]

Addresses the bug #291 where v2 quirks can't create WriteAttributeButton entities with a DIAGNOSTIC EntityType.

This change adds the required mapping to QUIRKS_ENTITY_META_TO_ENTITY_CLASS in discovery.py

[dmulcahey]

Just curious, what’s the use case here?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.33%. Comparing base (d30149c) to head (bab557c).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #308   +/-   ##
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  Coverage   96.33%   96.33%           
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  Files          61       61           
  Lines        9388     9388           
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  Hits         9044     9044           
  Misses        344      344           

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[jeverley]

Just curious, what’s the use case here?

Probably fairly niche, but some Aqara devices allow the user to trigger the device to restart (example below from my FP1E quirk):

This feels to me more like a diagnostic function (like Identify) rather than configuration.

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