Improve book library page query performance for author sort order (#4080)

* Add migration to create authorNames* columns, in libraryItems including update triggers and indices

* Add authorNames columns and indices to LibraryItem model

* Add database triggers for updating author names in libraryItems (for new databases)

* Populate authorNames during book scanning

* Update book sorting to use new authorNames columns

* Add an index on podcastEpisodes.publishedAt

* Fix group_concat order by and update to sqlite 3.44.2

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Co-authored-by: advplyr <advplyr@protonmail.com>

server/models/PodcastEpisode.js

@@ -122,6 +122,10 @@ class PodcastEpisode extends Model {
           {
             name: 'podcastEpisode_createdAt_podcastId',
             fields: ['createdAt', 'podcastId']
+          },
+          {
+            name: 'podcast_episodes_published_at',
+            fields: ['publishedAt']
           }
         ]
       }