Datasets create API - params validation

[ihsaan-ullah]

There are two fields in the datasets create api that are passed but not checked

1. name
2. file_name

There is no validation on these fields and seems important for the API. We need to check this in detail.

Also check the test in test_datasets: test_cannot_create_dataset_with_missing_fields to play with the test and do not pass name and file_name to see what happens.

NOTE

This api is used for competition, submission, programs, datasets creation so this should be checked with caution.