Feature/form rerender

[eric-burel]

Test: I am pressing a button of the slider, and check if the radiogroup below "Bonheur général" is also rerendered

Before (all stuff in color rerender):

After (all stuff in grey do not rerender => formLayout):

I could remove some rerenders but cutting the Form context more correctly between values that do not move (context is only used in order to avoid props drilling), values that moves (response state) and actions (updating a value, but not depending on the current global values). I've also used memo on the Radiogroup.

The problem I hit is that FormItem is too generic, and therefore require a lot of data. For instance, it uses the response to check for a dynamic path commentPath => that's no good, because it means you need to whole response to access only response[commentPath], but I can't really get around that yet.

We should try to avoid doing to much in the FormItem and perhaps move this kind logic to a callback passed by the parent, or some global context or whatever.

At least this PR cleans the code a little and opens room for more future optimizations.

Oh yeah and this has no impact on #237 (radiogroup on Firefox), probably because the radio still rerender.

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