Implement ListElements metadata_operator contains
Refs: https://gitlab.com/arkindex/requests/-/issues/457
It would be useful to have a new operator contains (or like if you prefer) to expose the Django contains operator on the metadata value
Refs: https://gitlab.com/arkindex/requests/-/issues/457
It would be useful to have a new operator contains (or like if you prefer) to expose the Django contains operator on the metadata value