Watch for added/removed local extensions (#1482)

Signed-off-by: Panu Horsmalahti <phorsmalahti@mirantis.com>

package.json

@@ -216,7 +216,9 @@
     "@types/react-beautiful-dnd": "^13.0.0",
     "@types/tar": "^4.0.3",
     "array-move": "^3.0.0",
+    "await-lock": "^2.1.0",
     "chalk": "^4.1.0",
+    "chokidar": "^3.4.3",
     "command-exists": "1.2.9",
     "conf": "^7.0.1",
     "crypto-js": "^4.0.0",