Create openAPI schema for parts of the REST API using Swagger

[fm3]

URL of deployed dev instance (used for testing):

• https://___.webknossos.xyz

Routes to document

• GET /api/datasets/:organizationName/:dataSetName
• GET /api/annotations/:typ/:id/info
• GET /api/annotations/:typ/:id/download
• POST /api/annotations/upload
• GET /api/datastores
• POST /data/datasets (uploadChunk)
• POST /data/datasets/finishUpload
• GET /data/datasets/:organizationName/:dataSetName/layers/:dataLayerName/data

Steps to test:

• visit /swagger.json - should list routes

Known issues

• return value schema is not included
• multipart/form or json body schema is not included (I describe it in the description instead)
• prefix /api is missing (anything that does not start with /data really starts with /api

Issues:

• fixes Generate OpenAPI schema for REST API #5643

---

• Updated (unreleased) changelog
• Ready for review

[jstriebel]

LGTM, thanks ❤️