Returns the content of the blob at the URL, url, from an Azure storage vault. options may be specified to control the following options:BlockSize : The number of bytes to read before waiting on the data consumer. The default value is 4 MB.RequestSize : The number of bytes to try to read in a single HTTP request to the server. The default value is 4 MB.ConcurrentRequests : The ConcurrentRequests option supports faster download of data by specifying the number of requests to be made in parallel, at the cost of memory utilization. The memory required is (ConcurrentRequest * RequestSize). The default value is 16.