InputManager: add a property to disable mesh checking in the onPointerOver event

[Popov72]

See https://forum.babylonjs.com/t/trigger-onpointerovertrigger-when-hovering-between-2-thin-instances/33943/3

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[sebavan]

Flagging to prevent merge to check how that fits in with @PolygonalSun work ?

[sebavan]

@PolygonalSun can you have a look at this PR to see if it does not conflict with your current work ?

[PolygonalSun]

@PolygonalSun can you have a look at this PR to see if it does not conflict with your current work ?

It doesn't look like it'd conflict or, at the very least, doesn't look like it has any side effects that'd affect my current work negatively.