Need an easy way to get the array of all current ball position values for what’s visible in the scene

[matthew-blackman]

Summary: This should be a method in the scene like in CCK.

[samreid]

await phetioClient.invokeAsync('centerAndVariability.medianScreen.model.sceneModel','getDataPoints',[]);

[samreid]

I also added an adapter that you can get/set the data for the currently selected scene in a model. Tested via await phetioClient.invokeAsync('centerAndVariability.variabilityScreen.model','getDataPoints',[]); in the variability screen.

[samreid]

This should be documented in the examples guide. Let's review it with the design team at an upcoming post-standup.

[catherinecarter]

Closing, will reference when the examples.md document gets created. Will copy the code above and explain how to get/set an array of ball locations.