fix: parse and stringify nonmodel fields

[Jshhhh]

Issue #, if available:

Description of changes:

• parse nonmodel fields on submit
• stringify nonmodel fields on update form load

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[codecov-commenter]

Codecov Report

Merging #882 (2be2f77) into main (12ccbcd) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #882      +/-   ##
==========================================
+ Coverage   92.89%   92.94%   +0.05%     
==========================================
  Files         116      117       +1     
  Lines        4925     4961      +36     
  Branches     1434     1441       +7     
==========================================
+ Hits         4575     4611      +36     
  Misses        329      329              
  Partials       21       21              

Impacted Files	Coverage Δ
...-react/lib/forms/form-renderer-helper/cta-props.ts	100.00% <100.00%> (ø)
...react/lib/forms/form-renderer-helper/form-state.ts	98.79% <100.00%> (+0.02%)	⬆️
...act/lib/forms/form-renderer-helper/parse-fields.ts	100.00% <100.00%> (ø)

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