Refactored config meta fields.

nomad/app/api/common.py

nomad/app/api/info.py

nomad/app/optimade/api.py

nomad/app/optimade/endpoints.py

nomad/app/optimade/index.py

nomad/app/optimade/models.py

nomad/cli/admin/run.py

nomad/cli/admin/uploads.py

nomad/cli/cli.py

nomad/config.py

nomad/processing/data.py

nomad/search.py

nomad/utils/structlogging.py

setup.py

tests/app/test_api.py

tests/app/test_optimade.py

tests/conftest.py

tests/parser_measurement.py

tests/processing/test_data.py

tests/test_cli.py