Adoption of Gender Harmony Recorded Sex or Gender (RSG) data element (https://jira.hl7.org/browse/FHIR-43834)

[dbojicic]

Fixes https://jira.hl7.org/browse/FHIR-43834.

Changes made:

• Remove the workaround Extension Recorded Sex Or Gender and related value set Recorded Sex Or Gender Type
• Added the RSG extension to AU Base Patient, AU Base RelatedPerson, and AU Base Practitioner
• Added terminology resources:
  • ValueSets: Common AU Recorded Sex or Gender Type, Common AU Recorded Sex or Gender (RSG) Source Document Jurisdiction, Common AU Recorded Sex or Gender (RSG) Source Document Type
  • CodeSystems: AU Recorded Sex or Gender Source Document Type, AU Recorded Sex or Gender Type
• Updated existing sex and gender examples for all three profiles
• Added implementation guidance
• Updated change log