[Feature Request] slot for day in date picker component

[alikamrani]

Problem to solve

Hi, I wanted to add a price below each day in the date picker component, but after searching the documentation, I realized that there isn't any slot for this. Could you please add this feature?

Proposed solution

adding a slot for changing any day

[Paul-DS]

It seems that this slot already exists in the VDatePickerMonth subcomponent: https://github.com/vuetifyjs/vuetify/blob/master/packages/vuetify/src/components/VDatePicker/VDatePickerMonth.tsx#L235

Would it be possible to just make it available in the VDatePicker component ?
I can eventually make a PR if that helps