feat: Expose InvalidSubmissionHandler and GenericValidateFunction types

[bgoscinski]

🔎 Overview

This PR exports InvalidSubmissionHandler and GenericValidateFunction types to make the following possible.

🤓 Code snippets/examples (if applicable)

const customValidator: GenericValidateFunction = (val, ctx) => {}
//                     ^^^^^^^^^^^^^^^^^^^^^^^

const { handleSubmit } = useForm<Form>(/* ... */)

const submit: SubmissionHandler<Form> = (form, ctx)  => {}

const handleInvalidSubmit: InvalidSubmissionHandler<Form> = (ctx) => {}
//                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

const triggerSubmit = handleSubmit(submit, handleInvalidSubmit)

✔ Issues affected

[logaretm]

Thanks!