feat: add fluttertoast localization with HarmonyOS support and ToastService

packages/fluttertoast_ohos/lib/fluttertoast_ohos.dart

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+import 'fluttertoast_platform_interface.dart';
+
+class FluttertoastOhos extends FluttertoastPlatform {
+  static void registerWith() {
+    FluttertoastPlatform.instance = FluttertoastOhos();
+  }
+}

packages/fluttertoast_ohos/lib/fluttertoast_platform_interface.dart

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+import 'package:flutter/services.dart';
+
+abstract class FluttertoastPlatform {
+  static FluttertoastPlatform? instance;
+
+  static const MethodChannel _channel =
+      MethodChannel('PonnamKarthik/fluttertoast');
+
+  Future<bool?> showToast({
+    required String msg,
+    String? toastLength,
+    int timeInSecForIosWeb = 1,
+    double? fontSize,
+    String? fontAsset,
+    String? gravity,
+    int? backgroundColor,
+    int? textColor,
+    bool webShowClose = false,
+    String webBgColor = "linear-gradient(to right, #00b09b, #96c93d)",
+    String webPosition = "right",
+  }) async {
+    final Map<String, dynamic> params = <String, dynamic>{
+      'msg': msg,
+      'length': toastLength,
+      'time': timeInSecForIosWeb,
+      'gravity': gravity,
+      'bgcolor': backgroundColor,
+      'iosBgcolor': backgroundColor,
+      'textcolor': textColor,
+      'iosTextcolor': textColor,
+      'fontSize': fontSize,
+      'fontAsset': fontAsset,
+      'webShowClose': webShowClose,
+      'webBgColor': webBgColor,
+      'webPosition': webPosition
+    };
+
+    bool? res = await _channel.invokeMethod('showToast', params);
+    return res;
+  }
+
+  Future<bool?> cancel() async {
+    bool? res = await _channel.invokeMethod("cancel");
+    return res;
+  }
+}

packages/fluttertoast_ohos/pubspec.yaml

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+name: fluttertoast_ohos
+description: Ohos implementation of the fluttertoast plugin.
+repository: https://github.com/PonnamKarthik/FlutterToast
+issue_tracker: https://github.com/ponnamkarthik/FlutterToast/issues
+version: 9.0.0
+
+environment:
+  sdk: ">=2.12.0 <4.0.0"
+  flutter: ">=1.10.0"
+
+flutter:
+  plugin:
+    implements: fluttertoast
+    platforms:
+      ohos:
+        package: io.github.ponnamkarthik.toast.fluttertoast
+        pluginClass: FlutterToastPlugin
+        dartPluginClass: FluttertoastOhos
+
+dependencies:
+  flutter:
+    sdk: flutter
+  fluttertoast:
+    path: ../fluttertoast
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter