Move restrict_future_timestamp option from db::config to cql_config. This
improves separation of concerns as timestamp validation is part of CQL query
execution behavior. Update validate_timestamp() function signature to take
cql_config reference instead of db::config, and update all callsites in
modification_statement and batch_statement to pass cql_config.
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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