[FEAT] Added a multiConsumer

lib/src/form/src/widgets/consumers.dart

@@ -34,6 +34,40 @@ class AstromicFieldConsumer<T> extends StatelessWidget {
   }
 }
 
+class AstromicMultiFieldConsumer extends StatelessWidget {
+  const AstromicMultiFieldConsumer({
+    super.key,
+    required this.controller,
+    required this.ids,
+    required this.builder,
+  });
+
+  final AstromicFormController controller;
+  final List<String> ids;
+
+  // Returns a Map where key is the field ID and value is the current field value
+  final Widget Function(BuildContext context, Map<String, dynamic> values) builder;
+
+  @override
+  Widget build(BuildContext context) {
+    // 1. Get all the listenable nodes for the requested IDs
+    final nodes = ids.map((id) => controller.node<dynamic>(id)).toList();
+
+    // 2. Use Listenable.merge to create a single trigger for all nodes
+    return AnimatedBuilder(
+      animation: Listenable.merge(nodes),
+      builder: (context, _) {
+        // 3. Rebuild the map of current values whenever any node changes
+        final values = {
+          for (var id in ids) id: controller.tryGet<dynamic>(id),
+        };
+
+        return builder(context, values);
+      },
+    );
+  }
+}
+
 /// A reactive consumer that listens to an entire dynamic group and its nested fields.
 ///
 /// Rebuilds whenever the group manifest changes (items added/removed) or when