Add --dry-run to uv pip uninstall

[moreati]

Summary

This proposes adding the command line option uv pip uninstall --dry-run ..., complementing the existing uv pip install --dry-run ... added for #1244 in #1436.

This option does not exist in PyPA's pip uninstall, if adopted it would be unique to uv pip. The code should be considered PoC, it is baby's first Rust.

The initial motivation was while investigating moreati/ansible-uv#2 - to allow Ansible module moreati.uv.pip to work withstate: absent in "check_mode" (Ansible's equivalent of a dry run), without requiring packaging or setuptools.

Test Plan

One new unit test has been added. I pedge to add more if the feature is desired/accepted

Example usage

➜  uv git:(pip-uninstall--dry-run) rm -rf .venv
➜  uv git:(pip-uninstall--dry-run) ./target/debug/uv venv                   
Using CPython 3.13.0
Creating virtual environment at: .venv
Activate with: source .venv/bin/activate
➜  uv git:(pip-uninstall--dry-run) ./target/debug/uv pip install httpx      
Resolved 7 packages in 178ms
Prepared 5 packages in 60ms
Installed 7 packages in 15ms
 + anyio==4.6.2.post1
 + certifi==2024.8.30
 + h11==0.14.0
 + httpcore==1.0.7
 + httpx==0.28.0
 + idna==3.10
 + sniffio==1.3.1
➜  uv git:(pip-uninstall--dry-run) ./target/debug/uv pip uninstall --dry-run httpx
Would uninstall 1 package
 - httpx==0.28.0
➜  uv git:(pip-uninstall--dry-run) ./target/debug/uv pip list                     
Package  Version
-------- -----------
anyio    4.6.2.post1
certifi  2024.8.30
h11      0.14.0
httpcore 1.0.7
httpx    0.28.0
idna     3.10
sniffio  1.3.1

[moreati]

This .dimmed() might be redundant, given the one 2 lines down.

[moreati]

This .dimmed() might be redundant, given the one 2 lines down.

[charliermarsh]

I think this is a good idea! Happy to review it.

[moreati]

Thanks, that was way faster and more decisive than I dreamed.