HarmonyOS 公共的头部如何实现，带有标题和返回按钮

示例参考如下：

@Component
struct CommonTitle {
  build() {
    Flex({ justifyContent: FlexAlign.Center }) {
      Image($r('app.media.arrow_left')).width(24)
      Column() {
        Text('我是标题')
          .fontSize(24)
      }
      .alignItems(HorizontalAlign.Center)
      .width('calc(100% - 24vp)')

    }
    .width('100%')
  }
}

@Entry
@Component
struct ShangH_issue06_01 {
  @State message: string = 'Hello World';

  build() {
    Column() {
      CommonTitle();
      Text(this.message)
        .id('HelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
        .backgroundColor(Color.Pink)
        .onClick(() => {
        })
    }
    .padding(10)
    .height('100%')
    .width('100%')
  }
}