Standard Schema support

[vkarpov15]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the feature has not already been requested

🚀 Feature Proposal

https://standardschema.dev/schema

Motivation

Got a request for this at an in-person meetup. A good idea - make it easier to reuse Zod etc. schemas for Mongoose or vice versa.

Example

Need to figure this out first, hopefully it would be similar to our existing toJSONSchema() methods, maybe a toStandardSchema() method?

[vkarpov15]

I've started working on this using hapijs/joi#3080 as an example