Quickstart earth analytics environment on Colab

[eculler]

Environment users would like to be able to use the earth-analytics-python-env on Google Colab without having to wait for more than a minute or two each time.

This will be accomplished using conda constructor. Constructor generates a shell script that can be used to quickly duplicate a conda environment (it saves the environment solution). Using the condacolab package, users will be able to install the environment from a github download url.

[eculler]

@nkorinek I've been working on this and I think I got it to work. However, I need the file hosted somewhere to check...so I'll do that after I submit a PR

[eculler]

I'm a little concerned there may be security issues here since we're posting an executable. But I don't know what those would be exactly...