[Feature Request] [VMenu] Ability to open the menu with a right-click event

Problem to solve

Currently the VMenu component can be opened either with a click-event (default) or on hover (configurable via a prop). A common use case (especially for large or "enterprise-class" applications) is to have a custom context menu which is invoked via a right-click. As things stand today, VMenu does not handle this out of the box.

Proposed solution

Create a new prop to VMenu called open-on-right-click or open-on-contextmenu (with a default value of false) which would behave the same as open-on-hover and open-on-click.

This would also involve updating the ClickOutside directive to handle both the onclick as well as the oncontextmenu events.

Start by inspecting the VMenu implementation and the ClickOutside directive, which the issue identifies as the affected areas. Trace how open-on-hover and open-on-click are handled, then verify that the proposed right-click option opens the menu and that outside click and contextmenu events close it appropriately; an open linked pull request indicates this work is already underway.