bug(@vtmn/react): VtmnQuantity "-" and "+" buttons should not validate form instantly

[gregorygossart]

Describe the bug
When used inside a form, VtmnQuantity "-" and "+" button validate form on click

Steps to reproduce

1. Create a form
2. Add a validation system on the form
3. Add an input with a required value inside the form
4. Add a VtmnQuantity inside the form
5. Do not fill the input
6. Click on the "-" or "+" button of VtmnQuantity
7. Form is validated and required input is displayed as "with error"

Expected behavior
VtmnQuantity "-" and "+" buttons should not validate the form on click.

An easy fix would be to add a type="button" directly on these two buttons.
A better way would be to add a default prop type = "button" on VtmnButton, but that could break the way some other components work.

Browsers affected
Chrome

Version affected
"@vtmn/react": "^3.1.2"

[stale]

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