feat: handle multiple tags on datasets and topics apis

[abulte]

Multiple tags filter is now supported and datasets and topics list APIs.

The filter is a AND, i.e. ?tag=tag1&tag=tag2 will return objects that have both the tag1 and tag2 tags.

• datasets api v1
• datasets api v2 (datasets/search through MongoEngine)
• topics api v1
• topics api v2 
• datasets api v2 w/ search service feat: handle multiple tags filter on datasets udata-search-service#50

[abulte]

We use store_missing=False because we don't want to send filters set to None to the search service (Mongo does not care).

[magopian]

Excellent work! Very well executed 🙏
I'm slightly confused as it seems we don't have the multi-tags implemented for the topics on the udata-search-service side, am I missing something?

[magopian]

Makes more sense indeed.

Note for self: we have the same pattern elsewhere

• udata/udata/core/reuse/apiv2.py

  Lines 29 to 30 in bfeae1b

  	search_parser.parse_args()
  	return search.query(ReuseSearch, **multi_to_dict(request.args))

• udata/udata/core/organization/apiv2.py

  Lines 34 to 35 in bfeae1b

  	search_parser.parse_args()
  	return search.query(OrganizationSearch, **multi_to_dict(request.args))

• udata/udata/core/dataservices/apiv2.py

  Lines 28 to 29 in bfeae1b

  	search_parser.parse_args()
  	return search.query(DataserviceSearch, **multi_to_dict(request.args))

[abulte]

Those could be refactored when multi-tags is introduced elsewhere (except for Organizations that don't have tags AFAIK).

[magopian]

Note to self: check, and remove in another cleanup PR if indeed unused.

[maudetes]

Thank you a lot for this PR 🚀
I think we can add a changelog entry and we're all clear!