CopyPollerBlobClient type
定义由 <xref:BlobClient> 返回的轮询程序正常工作所需的 <xref:BlobClient.beginCopyFromURL> 的作。
type CopyPollerBlobClient = Pick<BlobClient> & { startCopyFromURL(copySource: string, options?: BlobStartCopyFromURLOptions) => Promise<BlobBeginCopyFromURLResponse> }