feat(file-uploader): move files + add required prop + allow to clear from parent

[WaDadidou]

The real purpose of this PR

Better arborescence

Make <Label isRequired works

I've just added a required prop to FileUploader. We consider FileUploader as an "input". It has a Label and it is used in forms

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BONUS

Allow to clear the input type='file' in FileUploaderSmall from a parent using a ref

Not used yet, but used in Launchpad PR (#1024).
We can remove that from this atomic PR if you want

Usage

The point with that is that we can clear the file visually, that's ok (React state). BUT the file is still in the input type='file'.
So I've added this resetFiles cleaner.

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[MikaelVallenet]

LGTM