HarmonyOS 如何实现清除缓存，就是清除硬盘缓存，删除web组件加载的所有的js文件、图片等内容

参考示例：

// xxx.ets
import { webview } from '@kit.ArkWeb';
import { BusinessError } from '@kit.BasicServicesKit';

@Entry
@Component
struct WebComponent {
  controller: webview.WebviewController = new webview.WebviewController();

  build() {
    Column() {
      Button('removeCache')
        .onClick(() => {
          try {
            this.controller.removeCache(false);
          } catch (error) {
            console.error(`ErrorCode: ${(error as BusinessError).code},  Message: ${(error as BusinessError).message}`);
          }
        })
      Web({ src: 'xxxx', controller: this.controller })
    }
  }
}
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参考链接：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-webview-V5#removecache