Add `minview` and `maxview` arguments to date inputs

First, a big thanks for bringing Shiny to Python! 🎉

This is a feature request to add new arguments to the input_date() and input_date_range() UI components. The minview and maxview arguments would set the minimum and maximum view mode of the datepicker object. From the end-user perspective, they constrain the selectable dates:

• minview sets the temporal resolution the user can select. Very helpful if you want the end-user to input a month (minview = "months") or year (minview = "years").
• maxview prevents zooming-out too far, depending on context. This can make UI navigation less error-prone.

Note: I chose the argument names based on the existing startview argument.

Start at the input_date() and input_date_range() entry points and inspect how the existing startview argument reaches the datepicker. Add minview and maxview with the stated month/year selection and zoom limits, then verify both components' datepicker behavior.