youtube-dl refactor (#956)

* Consolidated all youtube-dl calls into one function
* Downloads can now be cancelled and better "paused"
* Removed node-youtube-dl dependency
* Added ability to manually check a subscription, and to cancel a subscription check

---------

Co-authored-by: Dedy Martadinata S <dedyms@proton.me>

backend/package.json

@@ -33,6 +33,7 @@
     "command-exists": "^1.2.9",
     "compression": "^1.7.4",
     "config": "^3.2.3",
+    "execa": "^5.1.1",
     "express": "^4.18.2",
     "express-session": "^1.17.3",
     "feed": "^4.2.2",
@@ -61,10 +62,10 @@
     "read-last-lines": "^1.7.2",
     "rxjs": "^7.3.0",
     "shortid": "^2.2.15",
+    "tree-kill": "^1.2.2",
     "unzipper": "^0.10.10",
     "uuidv4": "^6.2.13",
     "winston": "^3.7.2",
-    "xmlbuilder2": "^3.0.2",
-    "youtube-dl": "^3.0.2"
+    "xmlbuilder2": "^3.0.2"
   }
 }