Run pyrefly with python/pip

[ndmitchell]

Describe the Bug

% python3 -mpip install pyrefly; python3 -mpyrefly
Defaulting to user installation because normal site-packages is not writeable
Requirement already satisfied: pyrefly in /Users/nshulga/Library/Python/3.12/lib/python/site-packages (0.23.1)
/usr/local/fbcode/platform010/Python3.12.framework/Versions/3.12/bin/python3.12: No module named pyrefly

Would be nice if that worked, because it works for other projects. Apparently lots of pure native packages ship a wrapper that basically does sys.exec(os.path.join(platform.binary_dir, os.path.basename(__file__)),...

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(Only applicable for extension issues) IDE Information

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[rchen152]

Apparently lots of pure native packages ship a wrapper that basically does sys.exec(os.path.join(platform.binary_dir, os.path.basename(__file__)),...

Yeah, I believe if we put something like this in a __main__.py file, then python3 -m pyrefly will work. May also need to tweak our maturin configuration (https://www.maturin.rs/index.html#mixed-rustpython-projects).