Add owner to group members

nomad/app/v1/models/groups.py

nomad/app/v1/routers/entries.py

nomad/app/v1/routers/groups.py

nomad/app/v1/routers/north.py

nomad/app/v1/routers/uploads.py

nomad/graph/graph_reader.py

nomad/groups.py

nomad/processing/data.py

pyproject.toml

requirements-dev.txt

requirements.txt

tests/app/v1/routers/test_groups.py

tests/fixtures/groups.py

tests/graph/test_graph_reader.py

tests/states/groups.py

tests/utils.py