Add Filter Sensor for Dehumidifier

[Cmdjamin]

Device type and model (or SN)

Midea 20 Pint Cube Dehumidifier

The description of new feature

This is a request to add in support for the filter status sensor for Midea dehumidifiers. I notice that this sensor has already been implemented for their air conditioners (woohoo!), so I'm hoping the same can be done for these units. :)