Initial implementation of Picker (#283)
* Add support for onPressUp to usePress
* Refactor useTypeSelect to use onKeyDown events instead of deprecated onKeyPress
* Open menu triggers on mouse down
* Restore focus back to button on close in MenuTrigger
* Select on press up and focus on hover support for menu items and listbox options
* Initial version of Picker
Co-authored-by: Danni <drobinson@livefyre.com>
