Log verbose info from pip install

[jakirkham]

When building packages with pip install using normal verbosity, information about CMake configuration and build steps is swallowed meaning this cannot be found in the CI logs. However a previous attempt to add -vv caused issues with GH logs rendering ( rapidsai/ci-imgs#151 )

To find a better balance between including this useful information and not making the logs unreadable, we might consider redirecting this information to a log file that is stored in the GH artifacts. That way we still have the information available to inspect when debugging issues with builds or packages while also not adding more content to GH logs

pip has support for logging builtin. So we could do something like this

[global]
log = pip_log.txt

Tried this locally with a package and it appears to do the right thing. The file is written in the same directory pip was called