Add formatWeekday prop

[swissspidy]

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Description

formatDay, formatMonth, etc. can all be customized via props — except for formatWeekday, which is used in MonthView/Weekdays here:

https://github.com/wojtekmaj/react-calendar/blob/b0dc446e2bd121ac356f38a56cfa9eec187d0f83/src/MonthView/Weekdays.jsx#L40-L54

Proposed solution

Add a formatWeekday prop to allow passing a custom formatter

Alternatives

No response

Additional information

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