request接口切换

FA模型接口	Stage模型接口对应d.ts文件	Stage模型对应接口
download(config: DownloadConfig, callback: AsyncCallback<DownloadTask>): void; download(config: DownloadConfig): Promise<DownloadTask>;	@ohos.request.d.ts	downloadFile(context: BaseContext, config: DownloadConfig, callback: AsyncCallback<DownloadTask>): void; downloadFile(context: BaseContext, config: DownloadConfig): Promise<DownloadTask>;
upload(config: UploadConfig, callback: AsyncCallback<UploadTask>): void; upload(config: UploadConfig): Promise<UploadTask>;	@ohos.request.d.ts	uploadFile(context: BaseContext, config: UploadConfig, callback: AsyncCallback<UploadTask>): void; uploadFile(context: BaseContext, config: UploadConfig): Promise<UploadTask>;