Add name authority enrichment support

Adds transformer to query Redis for name authority data and enrich records with that data.
Adds -a or --authorities switch to enable name authority processing in various pipelines/commands.

When authority processing is enabled, queries redis on localhost by default*; this can be overridden by setting --redis-url
on the command line or via the REDIS_URL environment variable.

* special provisions are made if argot detects it's running inside a container to use Docker's special hostname. This helps when running via docker-compose