Add a "Query Builder" function that uses SegmentRules

[moshthepitt]

Add a way to build a query that filters using SegmentRules.

A SegmentRule is essentially a rule that defines how to filter a certain model. What we need is add a function or other way to use SegmentRule objects to query and filter as desired.

For example you might have these segment rules:

rule1:
  - target_type: location
  - target_field: id
  - target_value: 5

rule2:
  - target_type: task
  - target_field: status
  - target_value: active

The above could then be used to build a query that filters for tasks where the location is id 5 and the status is active.