restructure cli.py->run.py, main.py->app.py

[oplatek]

Why the restructure?

• one can simply launch factgenie/run.py for debugging
  • added if __name__ == "__main__": create_app().run(debug=True)
• run.py is entry point
  • for cli launch because it defines create_app factory
  • for click factgenie click CLI commands: list_outputs, list_datasets, list_campaigns, show_dataset_info

It enables us to create simple VSCode debug setup stored typically in ./vscode/launch.json

{
    "configurations": [

        {
            "type": "debugpy",
            "request": "launch",
            "name": "Launch factgenie",
            "program": "${workspaceFolder}/factgenie/run.py",
        }
    ]
}