Support for equality for collections of primitives

[piotrszul]

Adding support for equality operators (= and !=) for collections of Fhirpath primitive types and additional Pathling literal types (eg. Coding) according to the Fhirpath spec. Including empty collections.

FHIR R4 Exclusions

Details

au.csiro.pathling.errors.InvalidUserInputError: Operands must be comparable

• name = name [** testEquality25]
• name != name [** testNEquality19]

java.lang.RuntimeException: Expected a single value, but found multiple values

• Patient.name.given != {} [** testCollectionNotEqualEmpty]

java.lang.RuntimeException: Expected a single value, but found multiple values

• Patient.name.where(given = 'Jim').count() = 1 [** testWhere2]
• Patient.name.where(given = 'X').count() = 0 [** testWhere3]
• Patient.name.where($this.given = 'Jim').count() = 1 [** testWhere4]