Upload process usability

[chrwm]

Not sure, whether this issue should be here or in oedatamodel-api

Problems

1. When uploading new data versions, it is not checked whether a data version already exists. The upload does not fail.
   https://openenergy-platform.org/dataedit/view/model_draft/cm_sedos_pipline_test

2. Currently, the primary keys in the id column have to be continuous to the already existing keys on the OEP. This results in users having to check existing keys first and locally changing their keys to be in sequence with the keys on the OEP. This is unneccesary workload in my opinion. I remenber, that in open_MODEX this was handled automatically. Thus, independet what primary key was given in the local csv, when appending the data to the OEP table, primary keys were updated with continuous id's.