Use CMR "Search After" for collection and granule queries

[chuckwondo]

Use Search After for collection and granule queries, which is the recommended approach for paging, especially for deep paging, as it is much more efficient than using page_num, and also does not have the limitations that come with using page_num, which are as follows (see Paging Details):

Note: In the event which an ingest or delete occurs between paging requests, the order of your results may change, causing inconsistent results across pages.

You can not page past the 1 millionth item. Please contact the CMR Team at cmr-support@earthdata.nasa.gov if you need to retrieve items in excess of 1 million from the CMR. Additionally granule queries which do not target a set of collections are limited to paging up to the 10000th item.

[frankinspace]

Does this library issue cmr queries? Perhaps it should use https://github.com/nasa/python_cmr