fix: able to run multiple pytest cases

[wangyoucao577]

• allow to run multiple test cases for python extensions
• let users to customize the pytest args for more flexibility

[halajohn]

This method can partially address the issue, but it will cause a memory leak. Although the leak occurs at the end of testing and is not particularly critical, a better solution is as follows. It has already been implemented in the main branch, and the basic principle remains the same.

https://github.com/TEN-framework/ten_framework/blob/main/packages/core_extensions/default_async_extension_python/tests/conftest.py

[wangyoucao577]

OK. How about change python -s tests/ to pytest tests/ "$@" so that users can have more control of the pytest running.

[halajohn]

No problem, I think it's great. I'll add this change to my PR.