Add support for occupancy/vacancy groups in Lutron Caseta component (#33032)

* Add support for Lutron Caseta occupancy/vacancy sensors

This follows updates to pylutron-caseta to add support for these
devices. This code works for me as a custom component in Home Assistant
Core with pylutron-caseta 0.6.0 (currently unreleased).

* black formatting

* Update requirements_all.txt

* Apply black formatting

* Resolve some review comments

* serial -> unique_id

* Black formatting

* Resolve linting errors

* Add code owner...

* Fix isort complaint

* Fix remaining isort complaints

* Update codeowners

* Resolve outstanding review comments

* Remove caseta_