Provide a "top-area" or "top-extra" slot for custom content

[NicoHof]

There are extra slots for left and right sidebar
https://vue3datepicker.com/slots/content/#left-sidebar
https://vue3datepicker.com/slots/content/#right-sidebar
And also some oportunity to add extra content to the action area https://vue3datepicker.com/slots/content/#action-extra

We really like your vue3 datepicker with all its options to customize!
The only thing missing right now is a "top-area" or "top-extra" slot for custom content. Or did I just not find it?

We would need this to display some informational text to our users in some cases (date range limitations, etc.)

Describe the solution you'd like

• a custom slot without padding on the very top of the picker
  

Would love to see this feature.

Describe alternatives you've considered
The only way right now could be to use the "month-year" slot. (https://vue3datepicker.com/slots/components/#month-year)
But I would like to not touch this slot to keep the defaults and just add some custom content above this area.

Additional context
I saw this issue: #790
Ofc. left and right sidebar should be left and right and my feature request should resolve in a new slot.