Filtering DBs and option for pin(fav)(#2301)

* implemented search bar

* formatting corrected

* added pin(fav) and sorting in local in sidebar tree of DE

* reverted changes

* fixed lint and formatting issues

* fixed lint and formatting issues

* theme toggle button is disabled if in portal

* fixed lint error

* added link on disabled theme toggle button

* updated the variable for pin icon

* removed en-us from url

---------

Co-authored-by: nishthaAhujaa <nishtha17354@iiittd.ac.in>
Co-authored-by: sakshigupta12feb <sakshigupta12feb1@gmail.com>
Co-authored-by: Sakshi Gupta <sakshig@microsoft.com>

src/Shared/StorageUtility.ts

@@ -36,6 +36,8 @@ export enum StorageKey {
   AppState,
   MongoGuidRepresentation,
   IgnorePartitionKeyOnDocumentUpdate,
+  PinnedDatabases,
+  DatabaseSortOrder,
 }
 
 export const hasRUThresholdBeenConfigured = (): boolean => {