support `/processes` version

related to 
- https://github.com/Open-EO/openeo-aggregator/issues/149
- https://github.com/Open-EO/openeo-api/issues/548
- https://github.com/Open-EO/openeo-api/issues/517
- https://github.com/Open-EO/openeo-api/pull/549