support AWS keyspaces CDC stream for replay

[tarzanek]

AWS keyspaces migration would need streaming and replay
which we might want to support in similar way as DynamoDB streams (so it's configurable to be run by itself)

note that AWS keyspaces lack writetimestamps and ttl by default (they need to be enabled)

so replaying the stream might be tricky - we need to check if the stream will have a writetimestamp
(or replay in order)

https://docs.aws.amazon.com/keyspaces/latest/devguide/cdc_how-to-use-kcl.html