feat: add flutter_js dependency and implement JS runtime service

lib/services/flutter_js_service.dart

@@ -0,0 +1,11 @@
+import 'package:flutter_js/flutter_js.dart';
+
+late JavascriptRuntime jsRuntime;
+
+void initializeJsRuntime() {
+  jsRuntime = getJavascriptRuntime();
+}
+
+void disposeJsRuntime() {
+  jsRuntime.dispose();
+}

pubspec.lock

@@ -560,6 +560,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.21.2"
+  flutter_js:
+    dependency: "direct main"
+    description:
+      name: flutter_js
+      sha256: "6b777cd4e468546f046a2f114d078a4596143269f6fa6bad5c29611d5b896369"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.8.2"
   flutter_launcher_icons:
     dependency: "direct dev"
     description:

pubspec.yaml

@@ -71,6 +71,7 @@ dependencies:
   flutter_code_editor: ^0.3.3
   highlight: ^0.7.0
   flutter_highlight: ^0.7.0
+  flutter_js: ^0.8.2
 
 dependency_overrides:
   extended_text_field: ^16.0.0