Add niriss soss datamodel

[sosey]

Closes #

Resolves JP-

Description

This PR comes from a discussion with @eslavich about reference file validation and adds a datamodel for the niriss SOSS wavelength tables, the specwcs reference file...it likely still needs work, tests, a doc update and should be reviewed by @nden or someone familiar with niriss soss mode before acceptance. There's an example new reference file as well on CS.

Checklist

• [ ] Tests
• [ ] Documentation
• [ ] Change log
• [x] Milestone
• [x] Label(s)

[codecov[bot]]

Codecov Report

Merging #6338 (fd457c0) into master (aafc5c8) will increase coverage by 0.03%. The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #6338      +/-   ##
==========================================
+ Coverage   79.03%   79.06%   +0.03%     
==========================================
  Files         401      401              
  Lines       34335    34558     +223     
==========================================
+ Hits        27137    27324     +187     
- Misses       7198     7234      +36     

Flag	Coverage Δ		*Carryforward flag
nightly	79.04% <71.42%> (ø)		Carriedforward from 7196ca4
unit	56.94% <54.76%> (+0.01%)	:arrow_up:

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
jwst/datamodels/__init__.py	100.00% <ø> (ø)
jwst/assign_wcs/niriss.py	70.99% <52.94%> (-7.72%)	:arrow_down:
jwst/datamodels/wcs_ref_models.py	81.73% <84.61%> (+4.87%)	:arrow_up:

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