Make it easier to use MapAnchors with objects that need to update.

[nzjony]

Is your feature request related to a problem? Please describe.
See issue: #1369 Adding something to a MapAnchor requires a separate call to update the object. It should be possible to do some reflection on the objects in the MapAnchors and update them if they have this method.

Describe alternatives you've considered
The alternative is to have some sort of method:

map.addEventListener(MapViewEventNames.Render, () => { box.update(); });

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.