Executorlib export to Python Workflow Definition

For each of the three examples this repository consists of four files:

• workflow.py - the Python functions for the workflow
• executorlib-export.ipynb - the Jupyter notebook to export from executorlib to the Python Workflow Definition
• workflow.json - the JSON file generated by the export notebook
• validate-with-pyiron_base.ipynb - reloading the generated JSON file with pyiron_base and execute the workflow, to validate the consistency of the file