rust-utils: add Rust implementation of Python's "os.path.splitdrive"
I also wrote the NT version although I didn't mean to at first, so I thought
I would keep it, so that any further effort to get the Rust code working on
Windows is a little easier.
Differential Revision: https://phab.mercurial-scm.org/D7864
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
| contrib/python-zstandard/
'''
skip-string-normalization = true
quiet = true