Pre-computing Results of Oracle Queries

This file defines a function QueryImpl.withPregen that modifies a query implementation to take in a list of pre-chosen outputs to use when answering queries.

Note that ordering is subtle, for example so.withCaching.withPregen will first check for seeds and not cache the result if one is found, while so.withPregen.withCaching checks the cache first, and include seed values into the cache after returning them.