chore: move windows extras to standalone cli_windows example

examples/dart/cli_windows/hook/build.dart

@@ -0,0 +1,33 @@
+import 'dart:io';
+import 'package:archive/archive.dart';
+import 'package:logging/logging.dart';
+import 'package:native_assets_cli/native_assets_cli.dart';
+import 'package:native_toolchain_c/native_toolchain_c.dart';
+import 'package:path/path.dart' as path;
+
+void main(List<String> args) async {
+  final logger = Logger("")
+      ..level = Level.ALL
+      ..onRecord.listen((record) => print(
+          record.message + "\n"));
+
+  await build(args, (config, output) async {
+    final cbuilder = CBuilder.library(
+      name: "thermion_window",
+      language: Language.cpp,
+      assetName: 'thermion_window.dart',
+      sources: ['native/thermion_window.cpp'],
+      includes: ['native'],
+      defines: {"UNICODE":"1"},
+      flags:[],
+      dartBuildFiles: ['hook/build.dart'],
+    );
+
+    await cbuilder.run(
+      buildConfig: config,
+      buildOutput: output,
+      logger: logger,
+    );
+  });
+}
+