Add distortion transform to assign_wcs

[WilliamJamieson]

GitHub issue, Closes #462

Resolves RCAL-319

Description

Adds distortion transform to assign_wcs

Checklist

• Tests

• Documentation

• Change log

• Milestone

• Label(s)

[codecov]

Codecov Report

Merging #510 (4d1804e) into main (96db80f) will increase coverage by 0.54%.
The diff coverage is 93.10%.

@@            Coverage Diff             @@
##             main     #510      +/-   ##
==========================================
+ Coverage   82.33%   82.87%   +0.54%     
==========================================
  Files          39       39              
  Lines        1036     1057      +21     
==========================================
+ Hits          853      876      +23     
+ Misses        183      181       -2     

Flag	Coverage Δ		*Carryforward flag
nightly	82.33% <81.81%> (ø)		Carriedforward from 96db80f

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

Impacted Files	Coverage Δ
romancal/assign_wcs/assign_wcs_step.py	91.80% <93.10%> (+9.30%)	⬆️

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[nden]

lgtm