Fix intermittent crash with multiprocessing-aware logging

[AlgoFoe]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?

• On Windows, setting multiprocessing_aware=True can intermittently trigger shutdown errors when multiprocessing_logging is installed bcoz background logging threads may access closed pipe handles even in single-process exec.

What does this PR do?

• It avoids installing the multiprocessing_logging handler in the main process and only enables it when running inside child processes.

References

• Fixes Crash with multiprocessing_aware #78

How has this PR been tested?

• Tested locally on Windows by running start_logging() with multiprocessing_aware=True both with and without spawning child processes.

Is this a breaking change?

• No.

Does this PR require an update to the documentation?

• No.

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit