[pickers] Add Month and Year calendar button slots

[LukasTy]

Created from: #4662 (comment)

We currently do not have any slots targeting MonthCalendar and YearCalendar; thus those components are pretty hard to style/override in a more complex manner.

The idea is to at minimum add yearButton and monthButton slots.

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[jansepke]

@LukasTy I would like to help here and was able to add a slot for the yearButton to DateCalender and YearCalender but the PickersYear component is currently not exported. What is required to export a component? I can see at least these todos:

• export component and types in index.ts
• add PropTypes
• add JSDocs to PropTypes and TS Types

[LukasTy]

@jansepke I'm sorry for the late reply.
Could you clarify which component you are trying to turn into a slot?
Is it the PickersYear or PickersYearButton?
IMHO, it would be great to make the PickersYearButton component a slot and then there does not seem to be a need to export it, because the only thing it does is application of a few styles. 🤔
It could be styled via the sx prop or by passing a custom component.
What do you think?

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