HDV: handle urbanized areas that have “—“ in name

The issue is in the transportation electrification regional scaling factor files...

What about state boundaries? Define a strategy here...overall primarily seems like a research question.

An example of the issue is as follows:
`'Fayetteville--Springdale--Rogers, AR--MO'`
How do we deal with regions that multiple regions and potentially multiple states?

Start by inspecting the transportation electrification regional scaling factor files and trace how urbanized-area names are parsed. Use “Fayetteville--Springdale--Rogers, AR--MO” as the concrete case, then define and document a strategy for regions spanning multiple areas or states. Done means the strategy is agreed and the affected regional data can be handled consistently.

Written by the indexing model from the issue text.