Add extensions to Entity for domain, lights features

[jpelgrom]

Summary

The Wear OS details panel introduced a new location in the code base where entity properties are used to determine feature support, in addition to phone/'full Android' device controls. To prevent duplicate code or code getting out of sync, especially when more features are supported on Wear OS in the future, and perhaps in more places (widgets?), I propose using extensions to keep the code in one place and make code elsewhere easier to read.

I've added the code to the existing file used for the Entity data class, but maybe another location is better (in the util package, or a new common.data.util package)?

Screenshots

n/a

Link to pull request in Documentation repository

Not needed

Any other notes