Improve PyPI interoperability in conda env

[jaimergp]

Checklist

• I added a descriptive title
• I searched open issues and couldn't find a duplicate

What?

Improve PyPI interoperability in conda and conda env

Why?

Many conda users want to still use PyPI packages in their environments. However, the user experience for these users can be much improved.

User impact

Conda users will have a better experience when using PyPI packages. Fewer conda environments will be broken.

Goals

• Implement a conda subcommand that allows to interact with pip in a safer way. This tool will also protect the environment from PyPI tooling changes. Prototype at https://github.com/jaimergp/conda-pip.
• Allow conda env to use this tool instead of the regular pip subcommand.
• Investigate if there are changes needed in the solver to improve the experience.

Tasks

• All open issues in https://github.com/jaimergp/conda-pip
• conda_env installers / providers plugin hooks #13833
• Allow pip install flags to be recognized in environment files #6805

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