Add functionality for changing a Patinet ID and all references to it in other resources, when sending to the client (e.g., for anonymization).

[chandrashekar-s]

There is a general need from our clients to anonymize certain fields in the FHIR responses before returning them. This can be hooked into postProcess implementation.

However anonymizing identifiers in the resource and its associated resources is a general need and we need a reusable function which can do this. As part of this task create a reusable function which does the same.

[bashir2]

Thanks @chandrashekar-s for filing this. So just to clarify this a little bit more based on our conversation: The required functionality is to expose FHIR's Patient Compartment such that all references to a Patient ID in any resource can be updated to the anonymized ID. We use Patient Compartment internally, e.g., here to decide which resources belong to each patient. So we just need to expose this map and possibly build a Patient ID updater functionality around it.