Support for a popover sheet

[HadrienGardeur]

The popover sheet is a container component that we plan on using in many of our affordances.

It takes direct inspiration from the side sheet from Material Design 3 and the popover from Apple's Human Interface Guidelines.

Unlike the modal side sheet, we won't rely on a scrim applied to the rest of the page with this component and we'll display the modal side sheet right below the action that triggered its display (as Apple does with popovers).

The following methods for dismissing the popover sheet will be available:

• Esc key
• tap outside of the popover sheet
• click outise of the popover sheet

In terms of focus, the default focus should be on its content, then actions and finally the "close" affordance.