Feat/datepicker nomodal
Adds a no modal version of datepicker by giving the devs a few more levers to customize the date picker
- flat - prop to remove the elevation based box shadows as well as the border of the date picker
- hideFooter - prop to hide the date shortcut footer as well as the Ok/Cancel buttons
- onDayClick / onMonthClick / onYearClick - Added additional handlers that are triggered when the labeled datepicker element is clicked on.