Add support for reading and storing Recording MBIDs from file metadata (#12173)

* Add recording metadata provider

* Add recording MBID

* Save recording MBID during probing

* Set recording ID in probe result normalizer

* Add recording external media type

* Reimplement after changes in upstream

* Rename variable

* Rename variable

* Revert "Set recording ID in probe result normalizer"

This reverts commit 9dd18c8aba3f970a5816a13a33acf3d58b0e440f.

* Fix setting provider ID

* Simplify code

* Fix comment

* Add missing using

MediaBrowser.Model/Entities/MetadataProvider.cs

@@ -84,6 +84,11 @@ namespace MediaBrowser.Model.Entities
         /// <summary>
         /// The TvMaze provider.
         /// </summary>
-        TvMaze = 19
+        TvMaze = 19,
+
+        /// <summary>
+        /// The MusicBrainz recording provider.
+        /// </summary>
+        MusicBrainzRecording = 20,
     }
 }