GEOMESA-3435. mention scylladb in docs

[mkorolyov]

ScyllaDB is a drop in more performant replacement for Cassandra. It works out of the box with GeoMesa just by replacing connection string from Cassandra to ScyllaDB. Lets mention this in docs so people will be aware of such option.

[jnh5y]

Have you tested ScyllaDB with GeoMesa?

Is there a way that GeoMesa committers can test with ScyllaDB?

[mkorolyov]

Hey @jnh5y ,

Yes, I've tested ScyllaDB with GeoMesa. Cassandra quick start example works, all you need to do is to have running ScyllaDB on 127.0.0.1:9042(same default port) instead of Cassandra.

Regarding tests: original Cassandra module tests are using an embedded Cassandra server. This could be migrated to testcontainers, so we would run the same tests both for Cassandra and ScyllaDB. WDYT?

[elahrvivaz]

switching the cassandra module to use testcontainers would be nice - we just haven't gotten around to doing so.

[elahrvivaz]

Thanks for adding the docs! I don't think we should replace all mentions of Cassandra with Cassandra/ScyllaDB - how about adding a new scylladb/index.rst file that comes after Cassandra and just says that the Cassandra store is also compatible with ScyllaDB? And if there are any differences (e.g. /etc/scylla/scylla.yaml for config), call them out there.