Distribute FOQUS as a Conda package

[lbianchi-lbl]

• This was originally considered because of issues arising when installing the pip version of the pywin32 package within a Conda environment, that require pinning the version to the latest functioning, but outdated, version 225 (see Bump pywin32 from 225 to 301 #943)
• For FOQUS to be distributed as a Conda package, all dependencies must be installable as Conda packages

Motivation

• Short-term: somewhat streamlined workflow for setting up FOQUS for users
• Longer-term: having FOQUS as a Conda package would allow us to use packaging solutions in the Conda ecosystem

Steps

• Check how many of the current FOQUS dependencies have Conda packages available [^1]
• Check if any of the current dependencies can be made optional
• Update install documentation covering conda install

[^1] I have a vague recollection that PyQt 5.13 was (easily) available through PyPI but not Conda. However, I'd have to double-check.

[ksbeattie]

Related to: #1016

[lbianchi-lbl]

The following should now work:

conda create --yes --name test-conda-ccsi-foqus -c conda-forge -c CCSI-Toolset ccsi-foqus && conda activate test-conda-ccsi-foqus

[lbianchi-lbl]

New Conda packages will be created for FOQUS and TurbineClient as part of the upcoming release.

[ksbeattie]

This is possible, we need to make it a priority for it to happen.