Add ability to hide date-picker menu arrow

[mkeyy0]

Is your feature request related to a problem? Please describe.
I would like to have the ability to disable the rendering arrow for the date picker menu because it's required in my design. While it can be disabled by overriding a class applied to this arrow, it's an implementation detail of the date-picker component. It would be nice to provide a public prop for this

Describe the solution you'd like
Add a field to the config prop, something like menuArrowDisabled, to allow not rendering arrow of the date-picker menu

Describe alternatives you've considered
As I said, override a class that renders this arrow.

Additional context
No additional context

[mkeyy0]

Also close to that, it would be nice to have an option to disable this line, too. If some help is needed I would be happy to create a PR or assist in some other way!