JP-3110 Move dqflags and related from stcal to stdatamodels

[WilliamJamieson]

Resolves JP-3110

This PR moves:

• stcal.dqflags
• stcal.dynamicdq
• stcal.basic_utils

To stdatamodels. These modules appear to only be used by jwst.

This is to facilitate making stdatamodels independent of the JWST pipeline code, so that users of jwst pipeline products can open those products using tools like jdaviz without having to install the entire JWST pipeline. Instead, stdatamodels contains all the necessary code to unpack the asdf-in-fits objects embedded in some jwst pipeline products.

Fixes #133

Checklist

• added entry in CHANGES.rst (either in Bug Fixes or Changes to API)
• updated relevant tests
• updated relevant documentation
• updated relevant milestone(s)
• added relevant label(s)

[codecov]

Codecov Report

Patch coverage: 37.50% and project coverage change: +50.10 🎉

Comparison is base (314180a) 0.00% compared to head (60d344f) 50.10%.

❗ Current head 60d344f differs from pull request most recent head d0c3888. Consider uploading reports for the commit d0c3888 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #134       +/-   ##
===========================================
+ Coverage        0   50.10%   +50.10%     
===========================================
  Files           0      127      +127     
  Lines           0     7814     +7814     
===========================================
+ Hits            0     3915     +3915     
- Misses          0     3899     +3899     

Flag	Coverage Δ
unit	50.10% <37.50%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/stdatamodels/basic_utils.py	0.00% <0.00%> (ø)
src/stdatamodels/dqflags.py	0.00% <0.00%> (ø)
src/stdatamodels/dynamicdq.py	0.00% <0.00%> (ø)
src/stdatamodels/jwst/datamodels/dark.py	63.63% <100.00%> (ø)
src/stdatamodels/jwst/datamodels/darkMIRI.py	63.63% <100.00%> (ø)
src/stdatamodels/jwst/datamodels/dqflags.py	100.00% <100.00%> (ø)
src/stdatamodels/jwst/datamodels/flat.py	70.00% <100.00%> (ø)
src/stdatamodels/jwst/datamodels/fringe.py	63.63% <100.00%> (ø)
src/stdatamodels/jwst/datamodels/lastframe.py	63.63% <100.00%> (ø)
src/stdatamodels/jwst/datamodels/linearity.py	66.66% <100.00%> (ø)
... and 134 more

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[pllim]

This fixes #133

[hbushouse]

Looks reasonable to me. Just one question.