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This PR implements a new Menu component, using RAC Menu as a foundation. It also implements Popover, which is used internally by Menu and Select.
Menu provides a method to implement a dropdown navigation menu. It is composed of several subcomponents that can be used as needed:
MenuTrigger: a wrapper component that enables a trigger element (like aButton) to activate a menuSubmenuTrigger: a secondary wrapper, which can be used internally withinMenuto create submenusMenu: the container component, which renders aPopoverand expects some number ofMenuItemcomponents as childrenMenuItem: used to create individual items within a dropdown menuMenuSectionandMenuSectionHeader: used to create sections within a menuDocs and examples are provided in Storybook. Leaving this PR in draft pending design review.