Allow multiple useForm | provide unique id to useForm

[hhochart]

Is your feature request related to a problem? Please describe.

Currently there is not way to have multiple useForm in the same component. (#4550 , #3270)

Let's imagine a scenario where on a page, you have a filters on a sidebar and a top bar form. We might want to separate the validation for both components, and maybe also access the values from formA in formB.

Describe the solution you'd like

I was thinking of providing a key or id property to useForm (or useFormContext but it's not documented currently).

It would be used for the provide/inject pattern currently in place.

Describe alternatives you've considered

The only alternative we have currently is using a single useForm wrapping all our fields.

Maybe i'm missing something ?
Thanks !