[Clustered Bar] - Enabling defaultBarWidth

DefaultBarWidth is a concept that was in barPlots but didn't populate into ClusteredBar plots.  ClusteredBar plots should not have them enabled for position scales that are points-mode ordinal scales or quanititative scales.

Warning: ClusteredBar plots do not react well on position Quantitative scales, thus the defaultBarWidth may have unexpected behavior
Do we need lines above?