When importing a CSV file in a vocabulary, check for duplicate IDs

It is possible to import in a vocabulary a CSV file that has duplicate IDs.

Then, at runtime in nuxeo server, when the vocabulary is created, an error occurred because:

ERROR: duplicate key value violates unique constraint "studio_vocabulary_brand_pk"

Studio should check for duplicates.

Once the faulty Studio project is installed, to fix the problem:
-> Fix the duplicate(s) in the vocabulary
-> Stop the server
-> Explicitly remove the package of the project (mp-remove)
-> Start Nuxeo
-> Hot reload