Dataset sets management API endpoints

closes #1720 (closed)

requires !2264 (merged)

EDIT: contrary to what it says in the issue, the endpoints require contributor access to the dataset's corpus, excepted for DELETE which requires admin access.

TODO

• Update Dataset endpoints documentation (no more sets editing there)

arkindex/process/migrations/0032_processdatasetset_model.py

@@ -19,7 +19,7 @@ class Migration(migrations.Migration):
             fields=[
                 ("id", models.UUIDField(default=uuid.uuid4, editable=False, primary_key=True, serialize=False)),
                 ("process", models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name="process_sets", to="process.process")),
-                ("set", models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name="process_sets", to="training.datasetset")),
+                ("set", models.ForeignKey(on_delete=django.db.models.deletion.DO_NOTHING, related_name="process_sets", to="training.datasetset")),
             ],
         ),
         migrations.AddConstraint(