copyIncremental(copySource, options) {
        return this.client.sendOperationRequest({ copySource, options }, copyIncrementalOperationSpec);
    }
The Copy Incremental operation copies a snapshot of the source page blob to a destination page blob.
The snapshot is copied such that only the differential changes between the previously copied
snapshot are transferred to the destination. The copied snapshots are complete copies of the
original snapshot and can be read or copied from as usual. This API is supported since REST version
2016-05-31.
@param copySource Specifies the name of the source page blob snapshot. This value is a URL of up to
                  2 KB in length that specifies a page blob snapshot. The value should be URL-encoded as it would
                  appear in a request URI. The source blob must either be public or must be authenticated via a shared
                  access signature.
@param options The options parameters.