修复Web Message Channels模式通信问题 · Pull Request !52 · OpenHarmony-SIG/flutter_inappwebview

## 修复Web Message Channels模式通信问题
修复官方通信无法建立成功，不能相互发送和接收消息问题
```
 var webMessageChannel =
                        await controller.createWebMessageChannel();
                        var port1 = webMessageChannel!.port1;
                        var port2 = webMessageChannel.port2;

// set the web message callback for the port1
                        await port1.setWebMessageCallback((message) async {
                          print(
                              "Message coming from the JavaScript side: $message");
                          // when it receives a message from the JavaScript side, respond back with another message.
                          await port1.postMessage(
                              WebMessage(data: message! + " and back"));
                        });

// transfer port2 to the webpage to initialize the communication
                        await controller.postWebMessage(
                            message:
                            WebMessage(data: "capturePort", ports: [port2]),
                            targetOrigin: WebUri("*"));
```
## 修改fromMapWebMessageCompat中web_webview.WebMessageType类型，保持与android一致
[android](https://developer.android.com/reference/androidx/webkit/WebMessageCompat)
[ohos](https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V13/js-apis-webview-V13#webmessagetype10)

类型	指派人员	状态
审查	zjzhu aibin lihui	进行中 (0/1人)
测试	openharmony_ci	进行中 (0/1人)

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