Add a case_sensitivity keyword arguments to methods relying on pathlib (Python 3.12)

What is your issue?

Copied issue from https://github.com/xarray-contrib/datatree/issues/292

Motive

In Python 3.12, PurePath.match, Path.glob and Path.rglob now supports a case_sensitivity argument, so that the user have full-control on the behavior of the path matching.

https://docs.python.org/3/library/pathlib.html#pathlib.PurePath.match

Changed in version 3.12: The case_sensitive parameter was added.

https://docs.python.org/3/library/pathlib.html#pathlib.Path.glob

Changed in version 3.12: The case_sensitive parameter was added.

https://docs.python.org/3/library/pathlib.html#pathlib.Path.rglob

Changed in version 3.12: The case_sensitive parameter was added.

By default, None means "use OS defaults"

typically, case-sensitive on POSIX, and case-insensitive on Windows.

Proposal: Since datatree only supports POSIX-paths, the default behaviour in datatree should be case-sensitive.

Search the pathlib-dependent match, glob, and rglob entry points and review how their current arguments are exposed. Confirm the Python 3.12 behavior and compatibility constraints; done means callers can control case sensitivity while the default remains case-sensitive for datatree's POSIX paths.