List Objects ID (images, dataset, project, ...) by tag ID

[Tom-TBT]

Description

Hello Eric, I want to propose a function to list objects attached to tags get_object_ids_by_tag

Also includes a parameter describing how multiple tags should be combined according to one of the three set operations [union, intersection, difference].

Checklist

• [ ] Recompile the doc
• [ ] Add new units tests
• [ ] Clean style in the spirit of PEP8

For reviewers

• Check that the PR title is short, concise, and will make sense 1 year later.
• Check that new functions are imported in corresponding __init__.py.