FM2-126 Add support for mapping OpenMRS attribute types to FHIR

[parthfloyd]

FM2-456: Add Person Attribute Extensions Support to Patient Translator

Description of what I changed

Added support for handling person attributes as FHIR extensions in the Patient resource. Person attributes in OpenMRS can now be properly translated to and from FHIR extensions (Currently supporting String, Boolean, Concept & Location).

The implementation:

1. Adds a dependency on PersonAttributeTranslatorImpl for translation
2. Creates getPersonAttributeExtensions method to convert attributes to extensions
3. Updates toFhirResource to add extensions to the Patient resource
4. Updates toOpenmrsType to convert extensions back to OpenMRS person attributes

The implementation expects person attribute extensions to follow this nested structure:

{
  "extension": [
    {
      "url": "http://fhir.openmrs.org/person-attribute",
      "extension": [
        {
          "url": "http://fhir.openmrs.org/person-attribute#Birthplace",
          "valueString": "Lisbon"
        }
      ]
    }
  ]
}

Where:

• Outer extension with URL http://fhir.openmrs.org/person-attribute serves as a container
• Inner extensions represent individual attributes with type-specific values

Issue I worked on

see https://openmrs.atlassian.net/browse/FM2-126

Checklist: I completed these to help reviewers :)

• My IDE is configured to follow the [code style](https://wiki.openmrs.org/display/docs/Java+Conventions) of this project.

• I have added tests to cover my changes. (If you refactored
  existing code that was well tested you do not have to add tests)

• I ran mvn clean package right before creating this pull request and
  added all formatting changes to my commit.

• All new and existing tests passed.

• My pull request is based on the latest changes of the master branch.

cc: @icrc-jofrancisco , @icrc-fdeniger , @ibacher