HarmonyOS rcp通用请求的Promise封装

参考示例：

import rcp from '@hms.collaboration.rcp'
import { BusinessError } from '@kit.BasicServicesKit';

export default class RcpRequestUtil {
  session = rcp.createSession();

  constructor() {
  }
  requestUrl(url: string, type: string) {
    console.info('create request')
    let req = new rcp.Request(url, type);
    console.info('start ')
    this.session.fetch(req).then((response) => {
      console.info(`Response succeed: ${response}`);
    }).catch((err: BusinessError) => {
      console.error(`err: err code is ${err.code}, err message is ${JSON.stringify(err)}`);
    });
  }
  requestCancel() {
    this.session.cancel();
  }
}