Grimp

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* Upgrade PyO3 to 0.21.
* Follow symbolic links while walking through module files.
* Speed up find_illegal_dependencies_for_layers by using thread concurrency.

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* Allow configuring sibling layer independence.
* Fix bug where a warning would be logged if a non-Python file with multiple dots
in the filename was encountered.
* Formally add support for Python 3.12.

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* Add exclude_type_checking_imports argument to build_graph.

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* Stable release of functionality from 3.0b1-3.

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* Support for independent layers in find_illegal_dependencies_for_layers.

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* Switch to pyproject.toml.
* Rename upstream/downstream in find_illegal_dependencies_for_layers to importer/imported.
The original names were accidentally used in reverse; the new names have less potential for confusion.
* Use Rust extension module for find_illegal_dependencies_for_layers.