initial work to split into dart_filament and flutter_filament

flutter_filament/example/lib/picker_result_widget.dart

@@ -0,0 +1,21 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_filament/flutter_filament.dart';
+import 'package:dart_filament/dart_filament.dart';
+
+class PickerResultWidget extends StatelessWidget {
+  final FilamentViewer controller;
+
+  const PickerResultWidget({required this.controller, super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return StreamBuilder(
+        stream: controller.pickResult.map((result) {
+          return controller.getNameForEntity(result.entity);
+        }),
+        builder: (ctx, snapshot) => snapshot.data == null
+            ? Container()
+            : Text(snapshot.data!,
+                style: const TextStyle(color: Colors.green, fontSize: 24)));
+  }
+}