Automatically setup conda env

[bschilder]

Add a function that auto-installs miniconda and then sets up a conda env to .
This would only be run when:

1. an anndataR function (or unit test) requires reticulate.
2. the conda env is not already present.

Could use either reticulate or basilisk for this.

[bschilder]

Created new function: setup_conda

https://github.com/bschilder/anndataR/blob/rworkflows/R/setup_conda.R

[lazappi]

This should use {basilisk} for Bioconductor compatibility. I'm not 100% sure we want to mess around with Python environments in this package though.