[Cadence] Support Scylla database

[tchrischan]

Is your feature request related to a problem? Please describe.

Yes. Cadence now supports Scylla but the Banzai Cadence chart currently does not.

Describe the solution you'd like to see

Support for Scylla databases in the Helm chart.

Describe alternatives you've considered

Other than a manual k8s deployment, or forking this chart (which we may do anyway, and put in a PR), there are no known workarounds for us. The cql version Cadence uses for Cassandra is 3.4.4 and Scylla uses 3.3.1, so the pods will not start. Also, took a stab at setting protoVersion to 3 in the helmRelease, but Cadence apparently ignores it or it's a bug in the chart because it still uses protocol version 4.

Additional context