Replicate indexes when replicating DynamoDB tables

[julienrf]

Fixes #99

[julienrf]

Note that scylladb/scylladb#19718 is not a real blocker, it only makes our tests a bit weaker than expected.

[guy9]

Thanks, @tarzanek please review

[tarzanek]

so the only question is if this should be always on, or there should be a optional switch to skip them

[tarzanek]

okay, I see
scylladb/scylladb#11567

(ref https://opensource.docs.scylladb.com/stable/alternator/compatibility.html#unimplemented-api-features )

[tarzanek]

so LSI have to be populated immediatelly

but later on GSIs could be recreated once Scylla supports it, so at that time we will need optional switch to skip this (usually migration is slowed down by index creation and you want the index to be done in the end after all data is in, but it's just alternative, it's hard to say which option is better and it will depend on situation)

[tarzanek]

let's implement the switch once Scylla supports GSI re-creation