Test how content type can be indicated in DRS and acted upon

Test that the type attribute in DRS can successfully be used to indicate content type and that a workflow can act upon it to handle the content according to data type.
Two example use cases are:
Data from NCBI SRA data locator - attached example from SDL has both BAM and
[SDL_example2.txt](https://github.com/ga4gh/cloud-interop-testing/files/4903651/SDL_example2.txt)

SRA file types.
DICOM images

On the DICOM question there is also a related issue on [the question of type for access method](https://groups.google.com/a/ga4gh.org/d/msgid/ga4gh-cloud/9507b49b-0994-4b5f-97e5-d997cc71687en%40ga4gh.org?utm_medium=email&utm_source=footer)