[FHIR Connector] Add a general proxy function to forward requests to FHIR server with url rewrite#55

anjuchamantha merged 5 commits intoballerina-platform:mainballerina-platform/module-ballerinax-health.clients:mainfrom

anjuchamantha:fhirConnector-exportanjuchamantha/module-ballerinax-health.clients:fhirConnector-exportCopy head branch name to clipboard