Pairwise Multiple Ring Buffer

[AnnaMolter2]

Since pairwise buffer has been added to ArcGIS Pro, it would be useful to also add the pairwise functionality to the multiple ring buffer script to speed things up. 

[KenHartling]

This was implemented in ArcGIS Pro 2.6.

[DrewFlater]

Just to be clear, there is not a Pairwise Multiring Buffer tool, but the existing Multiring Buffer tool was enhanced to use pairwise/parallel processing tools in the source code for improved performance.