Add published decade filter option (#3489)

* Add strings for PublishedDecade and PublishedDecades

* Add publishedDecades filter options to LibraryFilterSelect

* Add publishedDecades to libraries store

* Add publishedDecades to getFilterData

* Add database method to add published decades to filter data

* Add published decade in BookScanner

* Add 'publishedDecades' to invalidFilters in user.js

* Add publishedDecades filter group to MediaGroupQuery

* Update client/strings/en-us.json

* Auto formatting

---------

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

client/store/libraries.js

@@ -240,7 +240,8 @@ export const mutations = {
       series: [],
       narrators: [],
       languages: [],
-      publishers: []
+      publishers: [],
+      publishedDecades: []
     }
     */
     const mediaMetadata = libraryItem.media.metadata
@@ -307,6 +308,16 @@ export const mutations = {
       state.filterData.publishers.sort((a, b) => a.localeCompare(b))
     }
 
+    // Add publishedDecades
+    if (mediaMetadata.publishedYear) {
+      const publishedYear = parseInt(mediaMetadata.publishedYear, 10)
+      const decade = Math.floor(publishedYear / 10) * 10
+      if (!state.filterData.publishedDecades.includes(decade)) {
+        state.filterData.publishedDecades.push(decade)
+        state.filterData.publishedDecades.sort((a, b) => a - b)
+      }
+    }
+
     // Add language
     if (mediaMetadata.language && !state.filterData.languages.includes(mediaMetadata.language)) {
       state.filterData.languages.push(mediaMetadata.language)