Respect the bounding_box in inverse transforms

[nden]

Fixes #496

This is a fix similar in spirit to #497 though it uses methods of modeling.ModelBoundingBox .

[codecov]

Codecov Report

Attention: Patch coverage is 78.12500% with 21 lines in your changes missing coverage. Please review.

Project coverage is 87.04%. Comparing base (eb9d316) to head (926123b).
Report is 20 commits behind head on master.

Files with missing lines	Patch %	Lines
gwcs/tests/conftest.py	30.00%	14 Missing ⚠️
gwcs/wcs.py	92.53%	5 Missing ⚠️
gwcs/api.py	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #498      +/-   ##
==========================================
- Coverage   87.28%   87.04%   -0.24%     
==========================================
  Files          22       21       -1     
  Lines        3821     3891      +70     
==========================================
+ Hits         3335     3387      +52     
- Misses        486      504      +18     

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[nden]

@bmorris3 Do you mind testing this PR with your code?
Since this changes the functionality, there are a number of failures in the jwst pipeline. I'll need to address them before this is merged or make this the non-default behavior.

[nden]

@Cadair Can you take a look at this PR and see if it's OK for sun related code?
Note that enforcing the bounding_box on the inverse transform now works and this can change results. If reproducing the bug is necessary, a parameter should be passed with_bounding_box=False.