[DevTask] The ContextMenu originating event is currently optional

Some extensions are not providing the `event` option to the ContextMenu. This is technically optional, but should be required to spawn the context menu. As we want to be able to Spawn ContextMenu without a amouse event (e.g. keyboard), using MouseEvent as the type should also be replaced with an interface for the actual params (e.g. spawn location, parent element).

This may need to wait until Litegraph context menus are replaced.

- Ref: rgthree https://github.com/Comfy-Org/litegraph.js/pull/728

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