Support --disable-pip-version-check and other pip flags

[jeffgeee]

uv is supposed to be a "Drop-in replacement for common pip, pip-tools, and virtualenv commands."

Recently testing with some python scripts which used --disable-pip-version-check I found this to not be the case, along with a few other flags. Was this being tracked anywhere?

[zanieb]

Please consult our compatibility guide: https://github.com/astral-sh/uv/blob/main/PIP_COMPATIBILITY.md

If there are things that aren't documented there, feel free to let us know or add in a pull request.

[charliermarsh]

I guess we could add that to the compatibility args but it's obviously a weird one.