feat: export/import functionality (backup/restore/share with friends) + a new input component (#433)

* feat: export schedule function to be added to handler

* feat: use UserScheduleStore and return json

* feat: download functionality

* feat: oh wow we already have a blob download util that is very very nice

* feat: return empty json if none found

* feat: import function completion

* feat: file uploading done

* feat: new input component-stories made-settings input replaced with component

* feat: attempt 1 to hook settings.tsx to importSchedule

* feat: it works horray aka using right Course constructor it works

* chore: fix jsdoc

* chore: comments and debug style

* docs: extra comment

* feat: name of schedule more user friendly

* feat: reworked how schedule is passed and check for file being schedule

* feat: color is kept on import

* fix: add sendResponse to exportSchedule

---------

Co-authored-by: doprz <52579214+doprz@users.noreply.github.com>

src/shared/messages/UserScheduleMessages.ts

@@ -63,4 +63,12 @@ export interface UserScheduleMessages {
      * @returns Undefined if successful, otherwise an error message
      */
     renameSchedule: (data: { scheduleId: string; newName: string }) => string | undefined;
+
+    /**
+     * Exports the current schedule to a JSON file for backing up and sharing
+     *
+     * @param data - Id of schedule that will be exported
+     * @returns
+     */
+    exportSchedule: (data: { scheduleId: string }) => string | undefined;
 }