Join Pathlike Object to Tree

[George-Ogden]

This extends the Tree.join and Tree.__truediv__ API to allow a pathlike object.
For example:

repo = Repo(my_local_repo)
interesting_filepath: Path = Path(folder) / file
blob = repo.tree() / interesting_filepath

This did not work before without explicitly converting the Path to a string, but works now.

[Byron]

Thanks a lot, this looks very good to me!

It's a bit sad that we have some test duplication to validate various types, but I guess it's better than not having them.
I will merge unless Copilot comes up with something more than nits that I can just apply.

[Copilot]

Pull request overview

This PR extends the Tree.join and Tree.__truediv__ API to support pathlike objects (such as pathlib.Path), enabling more Pythonic path handling when traversing Git tree objects. Previously, users had to explicitly convert Path objects to strings; now they can use them directly with the / operator.

• Type annotations updated from str to PathLike for both methods
• Implementation uses os.fspath() to convert PathLike objects to strings
• Comprehensive test coverage added for PathLike support with various scenarios

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
git/objects/tree.py	Updated join() and __truediv__() methods to accept PathLike parameters; added os.fspath() conversion; imported os module
test/test_tree.py	Added comprehensive test cases for string and PathLike path lookups covering simple, nested, folder, and invalid path scenarios; imported pytest, Repo, and PathLikeMock

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