[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: 0 B

Total Size: 864 kB

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.3 kB
packages/keypad-context/dist/es/index.js	760 B
packages/kmath/dist/es/index.js	4.27 kB
packages/math-input/dist/es/index.js	78 kB
packages/math-input/dist/es/strings.js	1.79 kB
packages/perseus-core/dist/es/index.js	1.48 kB
packages/perseus-editor/dist/es/index.js	280 kB
packages/perseus-linter/dist/es/index.js	22.2 kB
packages/perseus/dist/es/index.js	418 kB
packages/perseus/dist/es/strings.js	3.4 kB
packages/pure-markdown/dist/es/index.js	3.66 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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[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (89cf6d1) and published it to npm. You
can install it using the tag PR817.

Example:

yarn add @khanacademy/perseus@PR817

If you are working in Khan Academy's webapp, you can run:

./dev/tools/bump_perseus_version.sh -t PR817