Long press for Presablebuttons

[FlorianJa]

I would like to create similar button functionality as from the OS buttons in the start menu to open something like a context menu when a user pushes a button for a longer time (1 or 2 seconds).

The Interactable script provides the OnHoldReceiver with the functionlity I am looking for. However, this does only work properly when using the Far interaction. "Physically" pushing the button also triggers the OnHold event but also the OnClick Event. I would like to suppress the OnClick Event (from the PressableButton -> PhysicalPressEventRouter -> Interactable) when the button is pressed physically similar to the way it is done for the far interaction.

To reproduce

Steps to reproduce the behavior:

1. open the HandInteractionExamples scene.
2. create a short script to show the events in the console, something like this:

   
   public void OnClick()
   {
   Debug.Log("OnClick");
   }

public void OnHold() { Debug.Log("OnHold"); }

4. select a pressable button and wire up the event (from the reveiver region)
3. check the console output for far and near interaction.
4. You will see, that the OnClick AND the OnHold event will be triggered if you push the button (but not if you do it with the far interaction)

## Expected behavior

When the button is pushed for a longer time AND a OnHold event listener is defined, the OnClick event should suppressed.

## Your setup (please complete the following information)

- Unity Version 2020.03.20
- MRTK Version 2.7 (latest main commit)

## Target platform (please complete the following information)

- HoloLens 2
- 
## Additional context
I labeled this with "Bug" even if it is more like a feature request because the behaviour for far and near interaction is different.
I already created a "fix" for this and I will create a pull request.

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