[Feature Request] Add slot:number to the Step component.

[crotanite]

In the Step component it would be nice to have more control over the number section, a change like:

<span :class="cx('number')" v-bind="getPTOptions('number')"><slot name="number">{{ activeValue }}</slot></span>

[cagataycivici]

Thanks, better to add this to the issue tracker of PrimeVue, PRs are always welcome.