BG - On Interact (and possibly other events) could use an entity input

[j-conrad]

Is your feature request related to a problem? Please describe.
Sometimes it is useful to be able to store a child entity as a variable, especially when there will be other duplicate items with their own child objects that act as buttons, etc.
But then when referring to them in an On Interact event, you may want to be able to point to that child object in a non-explicit way.

Describe the solution you'd like
I'm proposing (if possible) adding an Entity input to the On Interact node. That way, you could change which entity the On Interact refers to in a dynamic (and reusable) way.

Describe alternatives you've considered
Putting the On Interact event in a graph on the child object itself works, but this proposal would be more modular and reusable.