Feat: Add variable assignment node #10427 (#11058)

### What problem does this PR solve?

Feat: Add variable assignment node #10427

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/canvas/node/variable-assigner-node.tsx

@@ -0,0 +1,11 @@
+import { IRagNode } from '@/interfaces/database/agent';
+import { NodeProps } from '@xyflow/react';
+import { RagNode } from '.';
+
+export function VariableAssignerNode({ ...props }: NodeProps<IRagNode>) {
+  return (
+    <RagNode {...props}>
+      <section>select</section>
+    </RagNode>
+  );
+}