Add Universal Powerline Bus (#34692)

* Initial version.

* Tests.

* Refactored tests.

* Update requirements_all

* Increase test coverage. Catch exception.

* Update .coveragerc

* Fix lint msg.

* Tweak test (more to force CI build).

* Update based on PR comments.

* Change unique_id to use stable string.

* Add Universal Powerline Bus "link" support.

* Fix missed call.

* Revert botched merge.

* Update homeassistant/components/upb/light.py

Co-authored-by: J. Nick Koston <nick@koston.org>

* Three changes.

Update service schema to require one of brightness/brightness_pct.
Fix bug in setting brightness to zero.
Replace async_update_status and replace with async_update.

Co-authored-by: J. Nick Koston <nick@koston.org>

homeassistant/generated/config_flows.py

@@ -141,6 +141,7 @@ FLOWS = [
     "twentemilieu",
     "twilio",
     "unifi",
+    "upb",
     "upnp",
     "velbus",
     "vera",