refactor(structure): move benchmarks, scenarios, adapters, utils to dedicated folders; update imports/project layout

benchmark_cherrypick/lib/benchmarks/async_chain_benchmark.dart

@@ -0,0 +1,23 @@
+import 'package:benchmark_harness/benchmark_harness.dart';
+import 'package:benchmark_cherrypick/di_adapters/di_adapter.dart';
+import 'package:benchmark_cherrypick/scenarios/async_chain_module.dart';
+
+class AsyncChainBenchmark extends AsyncBenchmarkBase {
+  final DIAdapter di;
+  AsyncChainBenchmark(this.di) : super('AsyncChain (A->B->C, async)');
+
+  @override
+  Future<void> setup() async {
+    di.setupModules([AsyncChainModule()]);
+  }
+
+  @override
+  Future<void> teardown() async {
+    di.teardown();
+  }
+
+  @override
+  Future<void> run() async {
+    await di.resolveAsync<AsyncC>();
+  }
+}