Capture patient's mother's maiden name and religion

[cragun47]

Describe the bug
Create FHIR Patient.extension.patient-mothersMaidenName (well-known extension) from PID-6.1

Create FHIR Patient.extension.patient-religion (well-known extension) from PID-17, use coding in table 0006

To Reproduce
Create a sample HL7V2.6 patient PID segment with aforementioned patient information.

Expected behavior
Patient information should be detected and added to corresponding fields in HL7 FHIR resources.

Example FHIR for mother's maiden name:

extension": [
 {
    "url": "http://hl7.org/fhir/StructureDefinition/patient-mothersMaidenName",
    "valueString": "BEILY"
 }

Example FHIR for religion:

      "extension": [ {
        "url": "http://hl7.org/fhir/StructureDefinition/patient-religion",
        "valueCodeableConcept": {
          "coding": [ {
            "system": "http://terminology.hl7.org/CodeSystem/v3-ReligiousAffiliation",
            "code": "1028",
            "display": "Lutheran"
          } ],
          "text": "Lutheran"
        }
      }

Additional context
Religion in HL7 V2.6 is from table 0006. It does not have a perfect correlation to FHIR extension for religion Map clear matches from V2.6 to FHIR, but be conservative in a first pass, and unclear matches should be left unmatched.

[LisaWellman]

In Release 1.0.9