Fix Plex media_player.play_media service (#27278)

* First attempt to fix play_media

* More changes to media playback

* Use playqueues, clean up play_media

* Use similar function name, add docstring

homeassistant/components/plex/server.py

@@ -1,5 +1,6 @@
 """Shared class to maintain Plex server instances."""
 import plexapi.myplex
+import plexapi.playqueue
 import plexapi.server
 from requests import Session
 
@@ -109,3 +110,16 @@ class PlexServer:
     def show_all_controls(self):
         """Return show_all_controls option."""
         return self.options[MP_DOMAIN][CONF_SHOW_ALL_CONTROLS]
+
+    @property
+    def library(self):
+        """Return library attribute from server object."""
+        return self._plex_server.library
+
+    def playlist(self, title):
+        """Return playlist from server object."""
+        return self._plex_server.playlist(title)
+
+    def create_playqueue(self, media, **kwargs):
+        """Create playqueue on Plex server."""
+        return plexapi.playqueue.PlayQueue.create(self._plex_server, media, **kwargs)