Remove Aqara Pet Feeder "legacy" quirks from ZHA

[iamjoshk]

Fixes #705
Dependent on PR for Aqara pet feeder quirk v2: updated PR for v2 migration: zigpy/zha-device-handlers#5296

This PR removes the "legacy" quirks from ZHA for the Aqara Pet Feeder.

• Binary Sensor AqaraPetFeederErrorDetected class
• Button AqaraPetFeederFeedButton class
• Number AqaraPetFeederServingSize and AqaraPetFeederPortionWeight classes
• Select AqaraFeedingMode and AqaraPetFeederMode classes
• Sensor AqaraFeedingSource, AqaraPetFeederLastFeedingSource, AqaraPetFeederLastFeedingSize, and AqaraPetFeederPortionsDispensed classes
• Switch AqaraPetFeederLEDIndicator and AqaraPetFeederChildLock classes
• Virtual AqaraFeederInit class

Also removes the now unused import for UnitOfMass in number init and sensor init.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.16%. Comparing base (7ea7e81) to head (814746e).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #883      +/-   ##
==========================================
- Coverage   97.19%   97.16%   -0.03%     
==========================================
  Files          57       57              
  Lines       10543    10440     -103     
==========================================
- Hits        10247    10144     -103     
  Misses        296      296              

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