feat(youtube): integrate YouTube video processing connector

- Added support for processing YouTube videos, including transcript extraction and document creation.
- Implemented a new background task for adding YouTube video documents.
- Enhanced the connector service to search for YouTube videos and return relevant results.
- Updated frontend components to include YouTube video options in the dashboard and connector sources.
- Added necessary dependencies for YouTube transcript API.

surfsense_web/hooks/useSearchSourceConnectors.ts

@@ -43,6 +43,12 @@ export const useSearchSourceConnectors = () => {
       name: "Extension",
       type: "EXTENSION",
       sources: [],
+    },
+    {
+      id: 4,
+      name: "Youtube Video",
+      type: "YOUTUBE_VIDEO",
+      sources: [],
     }
   ]);
 
@@ -108,6 +114,12 @@ export const useSearchSourceConnectors = () => {
         name: "Extension",
         type: "EXTENSION",
         sources: [],
+      },
+      {
+        id: 4,
+        name: "Youtube Video",
+        type: "YOUTUBE_VIDEO",
+        sources: [],
       }
     ];