[Feature request] Uninstall PIP packages

[Maslino]

Currently there is an experiment feature naming "Install PIP packages". "Uninstall PIP packages" feature is needed too. Possible usage case is:

ComfyUI is deployed in the cloud and user has no access to execute command. If there is some python package confilict such as opencv, user has no way to fix the confilict. So "Uninstall PIP packages" feature allows user to uninstall conflicted packages and reinstall the right one.

[arc1024]

Lock PIP packages Which Avoids important package like pytorch being upgraded automatically is also needed.

[hben35096]

Lock PIP packages Which Avoids important package like pytorch being upgraded automatically is also needed.

Especially for xformers, if the version is not chosen appropriately, it will alter the entire PyTorch environment.

[hben35096]

I am working on this series of functions, and the advantage of having them as nodes is that you can save them as a workflow, which allows for automatic installation next time.

[ltdrdata]

Lock PIP packages Which Avoids important package like pytorch being upgraded automatically is also needed.

While downgrades are already blocked for the basic dependencies of ComfyUI core, it seems it would be good to block not only downgrades but also upgrades for packages like torch.