feat: added ReactFlow-based node graph

Added ReactFlow to dependencies (@xyflow/react).
Added a basic reactflow template to test functionality of reactFlow and to build the visual programming UI on top of.

ref: N25B-114

src/main.tsx

@@ -1,7 +1,7 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 import './index.css'
-import App from './App.tsx'
+import App from './VisualProgrammingUI/VisProgUI.tsx'
 
 createRoot(document.getElementById('root')!).render(
   <StrictMode>