[Spike] JSON Schema generation

[jeremywiebe]

Summary:

SPIKE: DO NOT MERGE

While watching the Perseus Data Format meeting recording, I remembered an idea that we've batted around to generate a JSON Schema for our Perseus data format using the existing Typescript types.

This PR introduces a package.json script gen:schema which generates a JSON schema for the PerseusItem type as a proof of concept.

This wouldn't address all of our API needs, but it might help with external partners who consume the Perseus data format.

Issue: 'none'

Test plan:

[github-actions]

Size Change: +681 B (+0.08%)

Total Size: 836 kB

Filename	Size	Change
packages/perseus-editor/dist/es/index.js	267 kB	+69 B (+0.03%)
packages/perseus/dist/es/index.js	401 kB	+612 B (+0.15%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.1 kB
packages/kmath/dist/es/index.js	4.27 kB
packages/math-input/dist/es/index.js	80.5 kB
packages/math-input/dist/es/strings.js	1.73 kB
packages/perseus-core/dist/es/index.js	908 B
packages/perseus-error/dist/es/index.js	878 B
packages/perseus-linter/dist/es/index.js	21.8 kB
packages/perseus/dist/es/strings.js	3.22 kB
packages/pure-markdown/dist/es/index.js	3.68 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

_{compressed-size-action}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.26%. Comparing base (896a159) to head (a8effba).
Report is 18 commits behind head on main.

❗ Current head a8effba differs from pull request most recent head 44f1a83. Consider uploading reports for the commit 44f1a83 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #817      +/-   ##
==========================================
+ Coverage   69.08%   70.26%   +1.18%     
==========================================
  Files         472      477       +5     
  Lines      101103   101326     +223     
  Branches     7216    10890    +3674     
==========================================
+ Hits        69843    71200    +1357     
+ Misses      31082    30126     -956     
+ Partials      178        0     -178     

see 148 files with indirect coverage changes

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