Add react-datepicker as an eui package

[chandlerprall]

Bringing in react-datepicker as an internal package in EUI.

[snide]

WIP. Jumping in here to fix some stylings.

[snide]

@chandlerprall In styling this I noticed two bugs, one big, one small.

1. When focused on the time selector (when in cal view), the up/down arrows change the scroll position, not the focus in the list.
2. When you use the month/year "dropdowns", then close the selector, you can tab focus out of popup and back into the form. This is likely because one focustrap is exiting the other?

Otherwise I think we're good to go here.

[chandlerprall]

When focused on the time selector (when in cal view), the up/down arrows change the scroll position, not the focus in the list.

cannot reproduce (talked with Dave, neither can he)

When you use the month/year "dropdowns", then close the selector, you can tab focus out of popup and back into the form. This is likely because one focustrap is exiting the other?

I verified this will be fixed when we upgrade focus-trap

[chandlerprall]

@snide Pushed a couple small bug (below), everything should be ready for review.

• using an arrow key to open the date picker when focused on the input no longer scrolls the page
• flipped arrow keys for selecting the month in the month dropdown
• for Support seconds in EuiDatePicker #1345 , setting seconds value to 0 when a time is selected

[snide]

flipped arrow keys for selecting the month in the month dropdown

FYI this is only a problem with our implementation cuz i was doing CSS stupidity. But I'm ok with changing that here, it's just something to remember if we ever have to break it back out.

[snide]

Noticed a small issue where the global datepicker one does not seem to have the accessible class to highlight the calendar. Otherwise I ran through all my tests and your fixes and this seems to work!

This looks to be because it is missing the accessible classname. FWIW, the accessibility still works there, the class is just missing.

[chandlerprall]

Pushed an update to fix that calendar class.

[snide]

👍