Add tag props - Stepper Component

[Cyriljshaz]

Description

In the Stepper Component, it could be good if we add a tag: { type: String, default: 'h3' } props in const props = defineProps({ ... })
Currently, it's a h4 by default and we cannot switch for a h3.

Additional context

No response

[benjamincanac]

Would it work if we change this to a div? That's what I did in the Accordion component: 75e4792