Ability to return table values from `PBArray2D` via colum name and row number

[capsulecorplab]

PBArray2D currently doesn't support the ability to query elements of its table view via column name and row number, but it should as it is typically constructed using a dictionary of arrays.

Notes

PBArray2D>>rows:columns:tabulate:columnNames: setter method is currently implemented using a one-dimensional Array object, which kind of defeats the point of being a subclass of CTArray2D. Need to further investigate if it can be refactored to utilize setters/getters from CTArray2D instead.