Added translators for NDDataArray and StdDevUncertainty

[bmorris3]

Description

glue-astronomy currently supports data translation to/from a astropy.nddata.CCDData object, which is a subclass of astropy.nddata.NDDataArray, with slightly modified arguments and WCS handling. This PR implements support for NDDataArray as well as the associated uncertainty object StdDevUncertainty. I changed the name of the translator file to be more general (translators/ccddata.py -> translators/nddata.py) and modified the tests to cover the new cases.

This PR was put together to support of unit/mask/uncertainty propagation when collapsing data cubes represented as glue Data objects in jdaviz, in anticipation of also using the features implemented in astropy/astropy#14175.

[codecov]

Codecov Report

Base: 97.14% // Head: 96.99% // Decreases project coverage by -0.15% ⚠️

Coverage data is based on head (d4d4d20) compared to base (1380b85).
Patch coverage: 94.69% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
- Coverage   97.14%   96.99%   -0.16%     
==========================================
  Files          15       17       +2     
  Lines        1226     1296      +70     
==========================================
+ Hits         1191     1257      +66     
- Misses         35       39       +4     

Impacted Files	Coverage Δ
glue_astronomy/translators/nddata.py	92.55% <92.55%> (ø)
glue_astronomy/translators/__init__.py	100.00% <100.00%> (ø)
glue_astronomy/translators/tests/test_nddata.py	98.41% <100.00%> (ø)
glue_astronomy/conftest.py	100.00% <0.00%> (ø)
glue_astronomy/__init__.py	100.00% <0.00%> (ø)

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[astrofrog]

Looks great, thanks!