Move config and connections to Plex component (#26488)

* Move config and connections to component

* Separate imports

* Set a unique_id on sensor

* Set a platforms const

* Add SERVERS dict, hardcode to single server

* Move to debug

* Return false

* More debug

* Import at top to fix lint

* Guard against legacy setup attempts

* Refactor to add setup callback

* Review comments

* Log levels

* Return result of callback

* Store CONFIGURING in hass.data

* Set up discovery if no config data

* Use schema to set defaults

* Remove media_player options to remove entities

* Improve error handling

homeassistant/components/plex/server.py

@@ -1,5 +1,6 @@
 """Shared class to maintain Plex server instances."""
 import logging
+
 import plexapi.server
 from requests import Session