memmap/copy_arrays/lazy_load options not passed through from DataModel API

[braingram]

xref: https://jira.stsci.edu/browse/AL-562

DataModel allows the passing of memmap to lower level routines. However, that specification does not transfer into the asdf components. In addition, the kwargs dict is allowed, to specify any extra parameters to lower level I/O routines. However, these are ignored or overridden, again not reaching the appropriate asdf methods.

As a result, the asdf component is always memmap=True, lazy_load=True, and copy_arrays=False, regardless of specification. This may be by design; unclear what effect these have with asdf-in-FITS.

The ticket mentions some work towards this effort from ~3 years ago (not linking here to avoid names).

[braingram]

Although several of these options have changed I believe the issue with the kwargs still applies.