Add explicit 'yargs' dependency to theia/cli

Added explicit `yargs` dependency to `@theia/cli` under
`dev-packages`. Fixes an issue where users/extenders
cannot successfully use the `@theia/cli` package
when working outside of the main repository monorepo.

Originally from @cortopy #6418.

Signed-off-by: vince-fugnitto <vincent.fugnitto@ericsson.com>
Co-authored-by: Juan Jimenez-Anca <cortopy@users.noreply.github.com>

dev-packages/cli/package.json

@@ -31,6 +31,7 @@
   },
   "dependencies": {
     "@theia/application-manager": "^0.11.0",
-    "@theia/application-package": "^0.11.0"
+    "@theia/application-package": "^0.11.0",
+    "yargs": "^11.1.0"
   }
 }