Support ICD11

[rti]

🚀 Feature Description

Update the API to support using the current ICD-11-GM release on top to ICD-10.
ICD-11-GM is published by BfArM: https://www.bfarm.de/DE/Kodiersysteme/Services/Downloads/_node.html

BfArM publishes the ICD catalogues as a ClaML / XML. This can be converted to a FHIR CodeSystem using this tool . For ICD-10 a already parsed CodeSystem from Medizininformatik Initiative is available, but none for ICD-11 so far.

✔ Acceptance Criteria

• Add a CodeSystem with the current release of ICD-11-GM
• Make using ICD-10 or ICD-11 eligible