Create ingestion functionality for a scope config

[drtychai]

Expanding penums ingestion to accept a "scope config"-esque file would improve automation required for targeted launch and allow for potential integration into other tooling.

Possible parameters/types of configs:

• Top-level domains
• ASN (in conjunction with TLD or by itself)
• H1/BG scopes
• Service specific, e.g., web servers

Config will most likely take the form of a JSON.

Rate limiting and timeouts pose an issue to scalability; code should be refactored to improve scalability before this (or else this would work, but take forever / produce poor results). See #9