support additional generic for typing incoming body & query

would support something like this:

export default defineEventHandler<{ result: string }, { foo: string }>(async event => {
  const { foo } = await useBody(event)
  return {
    result: foo
  }
})

const result = await $fetch('/api/test', {
  body: {
    // auto-completing body, requiring 
  }
})

Follow-up tasks

• add support for typing query/body in Nitro generated types & ohmyfetch (via options)

possibly could also consider params?

[kevinmarrec]

I just released h3-typebox (source) 🚀

Feedbacks are welcome !

[pi0]

I would personnaly rename it to h3-validator (but fine with h3-typebox if listed in Readme as validator options) and support the new event object @kevinmarrec 😊

This issue is still open for a built-in validation. Conventionally, by using the integration name in h3-[integration] we can support other possible validators from community.