Adding pys2index dependency

[ljoakim]

Description

• Closes Add pys2index dependency #3576
• Link to documentation:

This PR adds the pys2index dependency, which is needed by the AERONET cmorizer (#3227, still in progress). The purpose of this PR is to have the pys2index package added to the environment in the image used when running tests on Circle, which will fix tests in #3227 failing due to this missing dependency.

pys2index has been added to setup.py as well, but is commented out to avoid same type of test fails as in #3227. This will be uncommented in that PR when this has been merged.

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[valeriupredoi]

many thanks @ljoakim 🍺