Design export netCDF capability in OpenAPI specification

[lewismc]

It was noted that the ability to export data as netCDF would provide utility. This issue will design and deliver that functionality within only the OpenAPI specification. We would need a way to GET a list of all tagbase data/file UID entries. The UID could then be used to GET /export?granule_id=XYZ. It is important for us to keep the parameter granule_id consistent regardless of how this is implemented.

[vtsontos]

Providing Links to the OIIP eTAG netCDF specification and sample CDLs covering both tag archival and summarized formats consistent with eTUFF:

• nc-eTAG specification document
• nc-eTAG netCDF CDL templates