Move the google.fhir.fhir_path package to google.fhir.core.fhir_path
Move the google.fhir.fhir_path package to google.fhir.core.fhir_path

PiperOrigin-RevId: 446032165

google/fhir,google/fhir,google/fhir,google/fhir,google/fhir,google/fhir