WIP for multiple domain support.

examples/domain.py

nomad/app/api/repo.py

nomad/cli/client/local.py

nomad/cli/parse.py

nomad/config.py

nomad/datamodel/__init__.py

nomad/datamodel/base.py

nomad/datamodel/dft.py

nomad/datamodel/ems.py

nomad/parsing/__init__.py

nomad/parsing/backend.py

nomad/parsing/parser.py

nomad/processing/data.py

nomad/search.py

ops/helm/nomad/values.yaml

tests/app/test_api.py

tests/conftest.py

tests/processing/test_data.py

tests/test_client.py

tests/test_files.py