Allow filtering by properties

[drkane]

https://reconciliation-api.github.io/specs/latest/#structure-of-a-reconciliation-query

properties Optionally, a map from property identifiers to a list of property values (or list of property values). These are used to further filter the set of candidates (similar to a WHERE clause in SQL), by allowing clients to specify other attributes of entities that should match, beyond their name in the query field. How reconciliation services handle this further restriction ("must match all properties" or "should match some") and how it affects the score, is up to the service;