Use Pyo3 extension traits for blocking methods to avoid deadlock with GIL

While performing blocking operations on Mutex an extension method lock_py_attached() defined in extension trait should be used to avoid deadlocks with GIL and conflict with Python's GC.

Similar methods from respective extension traits should be used when using any other synchronization mechanisms from standard library.

We would like to replace all unsafe methods used in the project in addition to configuring clippy::disallowed_methods in config.toml to disallow blocking methods that don't acknowledge holding the GIL.
This way using potentially dangerous methods will require explicit allow lint.

Start by searching the repository for blocking synchronization methods and inspect config.toml for existing Clippy configuration. Compare each use with the relevant PyO3 extension trait, then confirm that all unsafe methods are replaced and dangerous alternatives are explicitly disallowed by the lint configuration.