Add support for Windows legacy scripts via uv run (#11888)
## Summary
Closes https://github.com/astral-sh/uv/issues/9151
This adds support for running .ps1, .cmd, .bat legacy scripts typically
provided by setuptools [legacy script
files](https://packaging.python.org/en/latest/guides/distributing-packages-using-setuptools/#scripts).
Note, .bat and .cmd scripts were somewhat supported previously by
[Command](https://doc.rust-lang.org/std/process/index.html#batch-file-special-handling)
when the extension was explicit but documentation says such behavior
should not be relied upon.
In addition, when no extension is provided and a legacy script exists,
it will try to infer the appropriate extension on Windows and use the
right runtime with preference for .ps1. Only powershell.exe and cmd.exe
are supported right now.
## Test Plan
Added tests. Tested with nuitka locally via uv run.
Note uvx support will be added in a follow up.
