Full bounds of CountingObject needed before view has been created

[zepumph]

Promoting a TODO to an issue:

number-suite-common/js/common/model/CountingArea.ts

Lines 168 to 170 in 01cd67c

	//TODO https://github.com/phetsims/number-suite-common/issues/29 This is kind of a band-aid to keep the grouped objects' handles from sticking out of the top of the play
	// area since they are not yet included in countingObject.localBounds above without a view created
	const countingAreaBoundsMinY = this.groupingEnabledProperty.value ? 30 : 0;

in CountingArea.createCountingObjectFromCreatorNode, we have some magic numbers and algorithm that is trying to guess at the size of the "handle" sticking out above the objects. We should try to remedy this with:

1. Ideally positioning logic resolving after we have a view
2. Share a constant between view and model at the very least.

[zepumph]

Promoted its own issue from #29

[chrisklus]

@zepumph and I were able to fix this in a nice way in the above commits. Closing!