Make nonprocessed Optional for the Inferences

[stavrostheocharis]

Description

For the user it should be optional to upload the nonprocessed data for some reasons: a) we do not actually need them for now. Only for enhancement in the future for some reasons and b) maybe she does not want to give the real categorical vars but only the processed/renamed ones.

Solution

Just change the schema and also check the necessity use of the nonprocessed data inside the functions.

Additional context

[sinnec]

Should the nonprocessed data be also optional in dataset_rows?

[sinnec]

@momegas I've started working on it!

[momegas]

Yes they should be