Add extensions enable command (#7042)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

packages/cli/src/config/extension.ts

@@ -475,6 +475,10 @@ export function disableExtension(
   }
 }
 
+export function enableExtension(name: string, scopes: SettingScope[]) {
+  removeFromDisabledExtensions(name, scopes);
+}
+
 /**
  * Removes an extension from the list of disabled extensions.
  * @param name The name of the extension to remove.