[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

首先查看仓库中现有的 hello-world 示例和 Python Client 的使用模式；issue 中没有指定具体文件或测试。添加一个示例，展示从同步方法调用 client.start_workflow 或 client.execute_workflow，然后验证该示例是否作为 getting-started 体验的一部分运行。