skip json field

[jtarchie]

Describe the change
These adds the json:"-" feature to the JSON schema.
It allows a field on a struct to be skipped when marshaling for a schema.

Provide OpenAI documentation link
Provide a relevant API doc from https://platform.openai.com/docs/api-reference

Describe your solution
Describe how your changes address the problem or how they add the feature. This should include a brief description of your approach and any new libraries or dependencies you're using.

Tests
Briefly describe how you have tested these changes. If possible — please add integration tests.

Additional context
Add any other context or screenshots or logs about your pull request here. If the pull request relates to an open issue, please link to it.

Issue: #XXXX

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.77%. Comparing base (8c65b35) to head (f9c519a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1009      +/-   ##
==========================================
+ Coverage   85.49%   85.77%   +0.27%     
==========================================
  Files          43       43              
  Lines        2289     2291       +2     
==========================================
+ Hits         1957     1965       +8     
+ Misses        308      304       -4     
+ Partials       24       22       -2     

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[sashabaranov]

Thank you!