Update dev config

- Update to latest @eclipse-glsp/dev package
- Add `generate:index` utility script
- Fix codeActionsOnSave in vscode settings

examples/workflow-glsp/package.json

@@ -34,6 +34,7 @@
   ],
   "scripts": {
     "build": "tsc -b",
+    "generate:index": "glsp generateIndex src -f",
     "clean": "rimraf *.tsbuildinfo  lib",
     "generate:index": "glsp generateIndex src -f",
     "lint": "eslint --ext .ts,.tsx ./src",