Try out S2 for data storage

[nuest]

Try out storing data in S2 (https://github.com/google/s2geometry#python and https://github.com/google/s2geometry/tree/master/src/python, or https://pypi.org/project/s2-py / https://github.com/mira/s2-py or others: https://pypi.org/project/s2sphere/, https://github.com/qedus/sphere)

• [x] get a quick overview of existing Python implementations
• [x] write a test script that stores a geometry in S2
• [x] add the geometry to the map (without GeoDjango/Django)

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Classifying this as "small" just to make sure we're not wasting time.

[nuest]

Only works on linux, we will wait for new computer for @Kirubamoh to revisit this.

[Kirubamoh]

Live implementations : https://docs.s2cell.aliddell.com/en/stable/useful_s2_links.html