CASSANDRA-20938 CQLSSTableWriter supports ZSTD dictionary compression

[smiklosovic]

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The Cassandra Jira

[yifan-c]

Looks good overall. I have some nits and questions.

[yifan-c]

Curious, the input owner is always null in the code base. Why do we ever need this parameter? Maybe @jacek-lewandowski can share some context. Looks like the parameter is added in the SSTable format API patch.
In case it is consumed by some external system, should it be more clear if the owner is assigned when creating the AbstractSSTableSimpleWriter? So that we can avoid the fallback logic here.

[smiklosovic]

I added constructors accepting SSTable.Owner in both writers as suggested above. I would still keep this logic as is for integrations using this differently so it would be still compatible.