Feature request: Add useForm hook

[abdofola]

Instead of having a lot of useState to control your inputs inside a form, it would be much better to have a hook that could do this for you. What interesting is that to reduce the number of re-rendering; the hook by default makes your input uncontrolled and you need to opt-in to make it controlled.

I've already made a pull request #351 , that makes use of the above idea.