Feature request: group entities under a single device (Fit 3)

[igorsantos07]

I'm trying to configure a Petkit Fit 3 collar in HA, but was a bit complicated - besides the rough configuration steps, there's no device to search for... All entities for each device should be grouped under a single device, so it's easier to find and see all information at once.

It also makes it harder to bulk-rename the entities, since they're code-based instead of having "friendlier" names.

The integration also does not show in the Integrations list (I guess that's expected since it's completely manual?).