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Merged pull request https://github.com/scylladb/scylla/pull/5366 from Calle Wilund: Moves schema creation/alter/drop awareness to use new "before" callbacks from migration manager, and adds/modifies log and streams table as part of the base table modification. Makes schema changes semi-atomic per node. While this does not deal with updates coming in before a schema change has propagated cluster, it now falls into the same pit as when this happens without CDC. Added side effect is also that now schemas are transparent across all subsystems, not just cql. Patches: cdc_test: Add small test for altering base schema (add column) cdc: Handle schema changes via migration manager callbacks migration_manager: Invoke "before" callbacks for table operations migration_listener: Add empty base class and "before" callbacks for tables cql_test_env: Include cdc service in cql tests cdc: Add sharded service that does nothing. cdc: Move "options" to separate header to avoid to much header inclusion cdc: Remove some code from header