feat: More i35 support

[rainwoodman]

Fix a few bugs in i35 support.
Add sku for better model name inference.

[rainwoodman]

These attribute declarations typically do not mean anything in Python (some type checkers may use them, but due to backward compatibility its value is limited): I was mistyping water_shortage to wshortage and no checks were triggered.

To make typed properties we can declare

@property
def water_shortage(self) -> bool:
  """Returns True if the device reports a water shortage."""
  return safely_get_json_value(self._last_info['state'], ....)

That said I don't know whether the current style is conventional in homeassistant codebase. If you have no objections I will update the device_aws.py file to the strongly typed style (would require a update on the ha_blueair custom_component that I will file as well, since the attributes will be made read-only.

[dahlb]

looks good except the version being edited manually, also I like your idea of improving the typing with properties