@gxuu , please fix linter issue, always run the same linter git flow script

A few changes I'd suggest:

* Could we merge some of these examples?
  
  * `simple_client`, `send_object`, `disconnect_client` and `map_client` share 90% of the code, maybe you can merge them as a single file with basic use cases on how to use the Scaler's client.
  * `graphtask_nested_client` can be a little bit simplified, and possibly added to `graphtask_client`, to demonstrate that you can submit graph tasks from within a task.
  * `simple_scheduler` and `simple_cluster` could be merged in a single example showing the different ways of setting a Scaler cluster.

* What is the text wrapping setting for comments? I've the feeling that these are not consistent.

* Maybe use a docstring when describing the file's content, like I did here: https://github.com/rafa-be/parfun/blob/main/benchmarks/california_housing.py

I understand the refactoring purpose, but my thinking about this is slightly different, since this is for example, the goal for those should be executable and able to copy for each example, so it's better to be in one snippet