Feature/zod Alpha support for generating zod schemas

[Zambonilli]

#160

A new ILanguage implementation for generating typescript Zod schemas. The ILanguage implementation outputs a single file that exports a zod schema for each FHIR complex. In addition, a FhirResourceSchema that is a Zod union type is created for polymorphic scenarios like Bundle.

I list this code as alpha code because while I've been able to successfully validate all FHIR r4 examples successfully, the code is missing some functionality and has not been used in production.

Known Missing Features

• support for validating code systems
• exclusive or support for mutually exclusive fields like value* and date*.
• validations beyond structure like number or date constraints

Known Things I'd do before Production

• performance test the egregious use of zod lazy
• performance test bundle (is zod validating all items against all schemas in O(n*m) time or is it smart enough to realize resourceType is the discriminator)

[Zambonilli]

@microsoft-github-policy-service agree

[GinoCanessa]

Hi Mike, thank you for doing a pass of this! We are getting close to merging in a major refactoring of the internals that is in the experimental branch right now (I am hoping for either later this week or next).

Do you want me to make a pass at converting this over to the new structure or would you?

Thanks again!

[Zambonilli]

Oh cool, no worries on timing here and I'll watch for the experimental branch refactoring to merge to main and update this PR afterwards.

[GinoCanessa]

That sounds great, thanks!