BlobOpenReadOptions
Optional parameters for  OpenReadAsync
                
The buffer size (in bytes) to use when the stream downloads parts
            of the blob.  Defaults to 4 MB.
            
Optional  BlobRequestConditions to add conditions on
            the download of the blob.
            
The position within the blob to begin the stream.
            Defaults to the beginning of the blob.
            
Optional override settings for this client's  TransferValidation settings.
            This operation does not allow  AutoValidateChecksum
            to be set false.
            
Constructor.