useField's onChange function should accept non-string values as args

[JorensM]

Bug report

Current Behavior

Currently the useField()s onChange accepts either an event or a string. For inputs that are more complicated than simple strings, this won't suffice. For example if I want to have a field where the values are stored as an array, I won't be able to do that with the current type definitions for onChange

Expected behavior

I would expect the onChange to accept a value that is equal to the generic of useField. For example if I have useField<number[]>(), I'd expect the onChange to accept either an event or a value of type number[]

Suggested solution(s)

Change the onChange arg type definition to accept the generic that was passed to useField

Your environment

Software	Version(s)
Formik	2.4.5
React	1.8.2
TypeScript	5.1.3
Browser	Chrome
npm/Yarn	Yarn
Operating System	Windows 10