Cudf: [QST] more installation methods

[jangorecki]

I would like to request to support more installation methods.
I don't use docker, so according to https://rapids.ai/start.html I have two other methods left: conda and build from source.
I would prefer to avoid conda due to September's change to their terms of use.
So I am left with building from source, which is no fun.

It would be great if there would be other methods, for example

• installing into virtualenv (virtualenv works pretty well for me so far)
• installing from PPA apt packages

In the past there was pip but support for it was dropped, so probably it is still not an option.

[kkraus14]

@jangorecki the change of terms to conda's service only applies to the defaults channel in conda, it does not apply to the conda-forge, or rapidsai channels. We'll be confirming and removing the defaults channel from our installation instructions in the near future as we don't depend on anything in defaults directly.

[quasiben]

This blogpost from conda-forge should clear things up regarding the change in the ToS and conda-forge package hosting:
https://conda-forge.org/blog/posts/2020-11-20-anaconda-tos/

I've also tested using rapids _without_ defaults and things worked without issue