WIP: Add Python 3.13 compatibility

[pjbull]

Add support for Python 3.13, which is being released Oct 1, 2024.

The tricky thing here is that the glob logic in CPython has been totally updated and moved around. We depend on the pre-313 private API for the parsing of the pattern language and inclusion/exclusion as we do the tree walking. Vendored that logic for the time being, but may try a different implementation.

Other changes and todos for 3.13:

• .full_match added (needs test)
• .from_uri added (needs test)
• follow_symlinks kwarg added to is_file added as no-op
• follow_symlinks kwarg added to is_dir added as no-op
• newline kwarg added to read_text
• recurse_symlinks kwarg added to glob added as no-op
• pattern parameter for glob can be PathLike
• recurse_symlinks kwarg added to rglob added as no-op
• pattern parameter for rglob can be PathLike
• Globbing with a pattern that ends with “**” returns both files and directories. In previous versions, only directories were returned. needs test
• Add 3.13 to the automated test suite

Closes #472

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