Add WorkflowBuilder component and related modules

- Introduce `WorkflowBuilder` for visual workflow configuration
- Add child components: `WorkflowToolbar`, `StepConfigurationForm`, and `StepNode`
- Implement `WorkflowBuilderField` for integration with PayloadCMS
- Provide dynamic step type handling and JSON-based configuration editing
- Enhance UI with drag-and-drop functionality and step dependencies management

package.json

@@ -75,6 +75,7 @@
     "@payloadcms/ui": "3.45.0",
     "@playwright/test": "^1.52.0",
     "@swc/cli": "0.6.0",
+    "@types/handlebars": "^4.1.0",
     "@types/nock": "^11.1.0",
     "@types/node": "^22.5.4",
     "@types/node-cron": "^3.0.11",
@@ -135,7 +136,7 @@
   "registry": "https://registry.npmjs.org/",
   "packageManager": "pnpm@10.12.4+sha512.5ea8b0deed94ed68691c9bad4c955492705c5eeb8a87ef86bc62c74a26b037b08ff9570f108b2e4dbd1dd1a9186fea925e527f141c648e85af45631074680184",
   "dependencies": {
-    "jsonpath-plus": "^10.3.0",
+    "handlebars": "^4.7.8",
     "node-cron": "^4.2.1",
     "pino": "^9.9.0"
   }