IA-4285: Adding a FHIR API to retrieve org units

[madewulf]

Add a FHIR api to retrieve org units

IA-4285 create-a-fhir-retrieval-api-for-org-units

Self proofreading checklist

• [x] Did I use eslint and ruff formatters?
• [x] Is my code clear enough and well documented?
• [x] Are there enough tests?
• [x] Documentation has been included (for new feature)

Doc

In the new readme in /api/fhir

Changes

See the readme

How to test

See the readme

Notes

We should test now the integration with an external system, that was not done yet.

Follow the Conventional Commits specification

The merge message of a pull request must follow the Conventional Commits specification.

This convention helps to automatically generate release notes.

Use lowercase for consistency.

Example:

fix: empty instance pop up

Refs: IA-3665

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