[Feature Request] Sample of an activity calling a client to schedule or update a workflow

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

I would love to have a sample that shows how to do workflow->workflow interaction with a client, so : workflow->activity->client->workflow interaction

This is a common discussion with customers and a sample in go and python would be amazing to share with them.

Describe the solution you'd like

A sample that shows how to do a client inside a workflow's activity. Ideally it would start a schedule.

Our docs say it is a good option, and I want to point them in that direction:

Additional context

首先查看现有的 Python 示例以及已记录的 workflow-to-activity-to-client 交互流程。添加一个示例，展示 activity 使用 client 与另一个 workflow 交互，最好是通过启动 schedule 来实现，并确认该示例清楚地演示了所请求的交互。