Switch to using 2020 TIGER geometries and 2020 Census vintage

[katie-lamb]

Currently, the Census tract and county boundaries that are being used are from the Census DP1 database integrated with PUDL.

The new energy communities guidance specifies that census tract boundaries should be defined by the 2020 Census with 2020 TIGER/Line Geodatabases.

This will take a little bit of infrastructure/backend build out. Or maybe this should replace the Census DP1 database in PUDL?

Additionally, the new guidance specifies adjoining Census tracts that are separated by a river/waterway still count as "adjacent". Make sure this is handled when the new shapefiles are integrated.