rust-cpython: make `NonNormalEntires` iterable to fix `fsmonitor` (
issue6276)
This fixes a bug when using `fsmonitor` that tries to iterate on the non normal
set, by adding a shared iterator interface.
Differential Revision: https://phab.mercurial-scm.org/D8143
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true