issue/1806: Add fhirServerUrl support to enable FHIRPath resolve() function

[not-in-stock]

Summary

This PR adds support for the FHIRPath resolve() function in the @aehrc/sdc-populate package by passing the fhirServerUrl option to fhirpath.evaluate() calls.

Changes

• Update fhirpath dependency to ^4.5.0 (where resolve() was implemented)
• Add missing dev dependency @testing-library/jest-dom for tests
• Thread fetchResourceRequestConfig through functions that call fhirpath.evaluate():
  • evaluateFhirPathVariables()
  • evaluateFhirPathEmbeddings()
  • generateExpressionValues()
  • evaluateItemPopulationContexts()

Motivation

The resolve() function is a standard FHIRPath function that allows questionnaires to populate fields from referenced resources without requiring the calling application to pre-resolve all references manually.

Previously, expressions like %order.requester.resolve().name.first().family would fail silently and return empty values because fhirpath.evaluate() wasn't configured with a FHIR server URL.

Example

After this change, questionnaires can use expressions like:

{
  "linkId": "ordering-physician-name",
  "type": "string",
  "extension": [{
    "url": "http://hl7.org/fhir/uv/sdc/StructureDefinition/sdc-questionnaire-initialExpression",
    "valueExpression": {
      "language": "text/fhirpath",
      "expression": "%order.requester.resolve().name.first().given.first() & ' ' & %order.requester.resolve().name.first().family"
    }
  }]
}

Backwards Compatibility

This change is fully backwards compatible:

• If fetchResourceRequestConfig.sourceServerUrl is not provided, resolve() simply won't work (same as current behavior)
• All existing tests pass

Test Plan

• All existing unit tests pass
• Build succeeds
• Manually tested with a questionnaire using resolve() expressions in a SMART on FHIR app