try to add linux webview support

lib/component/webview/webview_linux_controller.dart

@@ -0,0 +1,70 @@
+
+
+import 'package:webview_cef/webview_cef.dart';
+
+import 'webview_controller_interface.dart';
+
+class WebviewLinuxController extends WebviewControllerInterface {
+
+  WebViewController controller;
+
+  WebviewLinuxController(this.controller);
+
+  @override
+  Future<void> reload() async {
+    await controller.reload();
+  }
+
+  @override
+  Future<void> goBack() async {
+    await controller.goBack();
+  }
+
+  @override
+  Future<bool> canGoBack() async {
+    return true;
+  }
+
+  @override
+  Future<void> goForward() async {
+    await controller.goForward();
+  }
+
+  @override
+  Future<Uri?> getUrl() async {
+    try {
+      if (url != null) {
+        return Uri.parse(url!);
+      }
+    } catch (e) {}
+    return null;
+  }
+
+  @override
+  Future<String?> getFavicon() async {
+    return null;
+  }
+
+  @override
+  Future<void> loadUrl(String url) async {
+    await controller.loadUrl(url);
+  }
+  
+  @override
+  Future<String?> getTitle() async {
+    return title;
+  }
+
+  String? title;
+
+  String? url;
+
+  void setTitle(String title) {
+    title = title;
+  }
+
+  void setUrl(String url) {
+    url = url;
+  }
+
+}