feat: support minimum / maximum for numbers

[mnahkies]

• includes minimum / maximum on the numeric ir model
• uses these to add validations with zod
• add prettier to fix bad inline-snapshot indentation (see https://github.com/jestjs/jest/issues/15014)
• memorize openapi validator in unit tests, speeding them up considerably (~6s -> ~1s for the zod spec file)
• improve test harness for zod to support directly providing IRModel objects, and also execute the resulting schemas to parse a value
  • this makes it easier to write a broader range of tests, and should also prevent misunderstandings of the zod API

Partially addresses #51