Support pip's --target

[henryiii]

The recipe for making a Python zipapp is something like this:

$ mkdir tmp
$ pip install --no-compile --target=tmp . dep_1 dep_2
$ cd tmpdir
$ python -m zipapp --compress --python=/usr/bin/env python3 --main=myapp.__main__:main --output=../myapp.pyz

However, uv is missing the --target option from pip. It would also be nice (for implementing this in a cross-installer way, inside something like nox) if --no-compile as a no-op in UV, rather than an error.

[zanieb]

This is a duplicate of #1517, could you chime in there instead?

[zanieb]

Regarding --no-compile we can definitely do that we have other arguments like that, that would be better tracked in a separate issue.

[henryiii]

I thought I searched - okay, thanks, did that. Also opened #2771 for --no-compile.