Refactored processing

.vscode/launch.json

nomad/api.py

nomad/processing.py

nomad/processing/__init__.py

nomad/processing/app.py

nomad/processing/handler.py

nomad/processing/state.py

nomad/processing/tasks.py

nomad/users.py

nomad/utils.py

tests/test_api.py

tests/test_processing.py

tests/test_utils.py