protected BlobServiceClient buildBlobServiceSyncClient(HttpClient httpClient, Configuration configuration,
      RequestRetryOptions retryOptions, AzureCloudConfig azureCloudConfig) {
    return null;
  }
Build {@link BlobServiceAsyncClient}.
@param httpClient {@link HttpClient} object.
@param configuration {@link Configuration} object.
@param retryOptions {@link RequestRetryOptions} object.
@param azureCloudConfig {@link AzureCloudConfig} object.
@return {@link BlobServiceAsyncClient} object.
ambry-cloud/src/main/java/com/github/ambry/cloud/azure/StorageClient.java