Extend NIRSpec wavelength ranges

[gbrammer]

Extend the wavelength limits in various NIRSpec reference files so that the extracted spectra aren't masked at extended wavelenghts. Currently this involves setting the F-Flat and S-Flat tables to constant values, which requires recalibration of the overall throughput.

[gbrammer]

This update also includes a new definition of the NIRSpec PSF and an associated lookup table to use it, which was derived from fixed-slit observations of the standard star P330E. A notebook showing how the PSF was generated is in the repo at https://github.com/gbrammer/msaexp/blob/extend-wavelength-range/docs/examples/lookup-table-psf.ipynb.

[codecov]

Codecov Report

Attention: Patch coverage is 28.94737% with 162 lines in your changes missing coverage. Please review.

Project coverage is 66.34%. Comparing base (6c66890) to head (63f3b9e).
Report is 22 commits behind head on main.

Files with missing lines	Patch %	Lines
msaexp/utils.py	21.05%	75 Missing ⚠️
msaexp/pipeline.py	4.44%	43 Missing ⚠️
msaexp/spectrum.py	42.85%	32 Missing ⚠️
msaexp/slit_combine.py	58.82%	7 Missing ⚠️
msaexp/resample_numba.py	55.55%	4 Missing ⚠️
msaexp/drizzle.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #82      +/-   ##
==========================================
+ Coverage   65.13%   66.34%   +1.20%     
==========================================
  Files          16       16              
  Lines        7151     7306     +155     
==========================================
+ Hits         4658     4847     +189     
+ Misses       2493     2459      -34     

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[gbrammer]

Fixed-slit spectrum of a bright standard star.
fs_1538_prism-clear_p330e_s1600a1.pixtab.fits.gz
fs_1538_prism-clear_p330e_s1600a1.spec.fits.gz