feat: add Pure Blizzard device from Klarstein (#5615)
* feat: add Pure Blizzard device from Klarstein
* Refactor Klarstein air conditioner YAML configuration
Updated model and entity definitions for Klarstein air conditioner.
Renamed file to follow naming convention
Separate out problem sensor
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Co-authored-by: Jason Rumney <make-all@users.noreply.github.com>