rust-status: return a ParallelIterator instead of a Vec from stat_dmap_entries
This allows the caller function to choose when and how the iteration and/or
collection happens. This change also cleans up the now unused `filter_map`.
Differential Revision: https://phab.mercurial-scm.org/D7299
[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