Add endpoint for workflow developer statistics

.gitlab-ci.yml

.pre-commit-config.yaml

app/api/endpoints/workflow.py

app/crud/crud_workflow.py

app/schemas/workflow.py

app/schemas/workflow_execution.py

app/tests/api/test_workflow.py

app/tests/crud/test_user.py

app/tests/crud/test_workflow.py

app/tests/crud/test_workflow_execution.py

app/tests/crud/test_workflow_version.py

app/tests/utils/user.py

app/utils/backoff_strategy.py

requirements-dev.txt