Add event platform for client cluster

[elupus]

• Add event platform client clusters
• Add LevelContro, On/Off, Color events for client clusters
• Enabled handling of ClientClusterHandlers
• Corrects naming of client cluster handlers

Depends on home-assistant/core#157853 for support in HA

[elupus]

Just noticed that #419 exists too. I think this is simpler and stands on the main standardized clusters.

[codecov]

Codecov Report

❌ Patch coverage is 97.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.32%. Comparing base (3adf2db) to head (71c527f).

Files with missing lines	Patch %	Lines
zha/application/platforms/event.py	96.96%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #594      +/-   ##
==========================================
+ Coverage   97.29%   97.32%   +0.02%     
==========================================
  Files          62       63       +1     
  Lines       10712    10790      +78     
==========================================
+ Hits        10422    10501      +79     
+ Misses        290      289       -1     

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[elupus]

Btw. I've explicitly avoided some fixed structure here. Tried to keep the original cluster commands as is. Currently HA has very few devices classes for events, so the structure of the event data there has not given correct structure.

Given the above situation, inventing some in-between structure that isn't 1 to 1 mapped to zigbee spec seem pointless and only adds complexity.

[elupus]

So rebased on the new cluster rework. Must say it looks much cleaner and less complicated.