Rewrite OpenAPI overrides with DRF 3.12
Django REST Framework 3.12 is finally here with many updates including support for OpenAPI components (#256 (closed)), overriding operation IDs, overriding serializer generation, field generation, assigning tags, or the whole operation object. This implies multiple breaking changes on the schema and we should not upgrade DRF until we have carefully reviewed the schema changes.
Bump merge requests from the