HarmonyOS 相机相册选图demo，打开相册可以调用相机拍照的

示例参考：

import { BusinessError } from '@ohos.base';
import picker from '@ohos.file.picker';
async function example01() {
  try {
    let photoSelectOptions = new picker.PhotoSelectOptions();
    photoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE;
    photoSelectOptions.maxSelectNumber = 5;
    let photoPicker = new picker.PhotoViewPicker();
    photoPicker.select(photoSelectOptions).then((photoSelectResult: picker.PhotoSelectResult) => {
      console.info('PhotoViewPicker.select successfully, photoSelectResult uri: ' + JSON.stringify(photoSelectResult));
    }).catch((err: BusinessError) => {
      console.error('PhotoViewPicker.select failed with err: ' + JSON.stringify(err));
    });
  } catch (error) {
    let err: BusinessError = error as BusinessError;
    console.error('PhotoViewPicker failed with err: ' + JSON.stringify(err));
  }
}

@Entry
@Component
struct Index {
  @State message: string = 'Hello World';
  build() {
    RelativeContainer() {
      Text(this.message)
        .id('HelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
        .onClick(() => {
          example01()
        })
    }
    .height('100%')
    .width('100%')
  }
}