Steps to add an operator:
- Update Queries::Operators.
- Update Queries::ParseBlock::Builder.
- Define context(s) in QueryContracts::WithQueryContexts.
- Add test cases in QueryContracts::ShouldPerformQueries.
- Add implementations to Basic::QueryBuilder.
Validates and returns an Array of criteria.
All values use :eq operator.
Extends ParseCriteria, passes Query#criteria to super.