Add support for workflow modes

.gitlab-ci.yml

.pre-commit-config.yaml

README.md

app/api/endpoints/workflow.py

app/api/endpoints/workflow_execution.py

app/api/endpoints/workflow_version.py

app/api/utils.py

app/crud/__init__.py

app/crud/crud_bucket.py

app/crud/crud_user.py

app/crud/crud_workflow.py

app/crud/crud_workflow_execution.py

app/crud/crud_workflow_mode.py

app/crud/crud_workflow_version.py

app/schemas/workflow.py

app/schemas/workflow_execution.py

app/schemas/workflow_mode.py

app/schemas/workflow_version.py

app/tests/api/test_security.py

app/tests/api/test_workflow.py