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`check_and_repair_cdc_streams` is an existing API which you can use when the current CDC generation is suboptimal, e.g. after you decommissioned a node the current generation has more stream IDs than you need. In that case you can do `nodetool checkAndRepairCdcStreams` to create a new generation with fewer streams. It also works when you change number of shards on some node. We don't automatically introduce a new generation in that case but you can use `checkAndRepairCdcStreams` to create a new generation with restored shard-colocation. This PR implements the API on top of raft topology, it was originally implemented using gossiper. It uses the `commit_cdc_generation` topology transition state and a new `publish_cdc_generation` state to create new CDC generations in a cluster without any nodes changing their `node_state`s in the process. Closes #13683 * github.com:scylladb/scylladb: docs: update topology-over-raft.md test: topology_experimental_raft: test `check_and_repair_cdc` API raft topology: implement `check_and_repair_cdc_streams` API raft topology: implement global request handling raft topology: introduce `prepare_new_cdc_generation_data` raft_topology: `get_node_to_work_on_opt`: return guard if no node found raft topology: remove `node_to_work_on` from `commit_cdc_generation` transition raft topology: separate `publish_cdc_generation` state raft topology: non-node-specific `exec_global_command` raft topology: introduce `start_operation()` raft topology: non-node-specific `topology_mutation_builder` topology_state_machine: introduce `global_topology_request` topology_state_machine: use `uint16_t` for `enum_class`es raft topology: make `new_cdc_generation_data_uuid` topology-global