[Feature Request] Create sample for calling Python Client from a sync method

Is your feature request related to a problem? Please describe.

There are many Temporal users that have existing Python code bases that are only sync, and for these users learning how to invoke the Temporal Client is toil, as they may not be fully versed in asyncio and the event loop. Having a sample that provides a snippet on how to use the Temporal Client from an existing sync method would be very helpful for these folks as part of the getting started experience.

Describe the solution you'd like

I'd like a hello world style sample that creates a client and then invokes client.start_workflow or client.execute_workflow from within a synchronous method

Additional context

Examinez d’abord les exemples hello-world existants du dépôt et les modes d’utilisation de Python Client ; aucun fichier ni test précis n’est indiqué dans l’issue. Ajoutez un exemple dans lequel client.start_workflow ou client.execute_workflow est appelé depuis une méthode synchrone, puis vérifiez que l’exemple s’exécute dans le cadre de l’expérience getting-started.