eliminate sbem.interface by moving entities to more suitable locations #8
Description
sbem.interface currently is solely responsible for excel ingestion, and a stale library class.
I recommend we delete sbem.interface entirely, and relocate the excel ingestion methods to either (a) be colocated in sbem.prisma.connectors.py or (b) in a new sbem.connectors folder within a file called (something like) sbem/connectors/excel.py
The ComponentLibrary class can either be safely deleted after verifying that nothing is using it currently, or moved into its own module in the sbem.components folder called library. It's currently unused, but there's a world where we do use a global cache of namedobjects (soon to be NamedComponents! #6 ). See #9 for more discussion of a global cache/deduping