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This series adds a global read barrier to raft_group0_client, ensuring that Raft group0 mutations are applied on all live nodes before returning to the caller. Currently, after a group0_batch::commit, the mutations are only guaranteed to be applied on the leader. Other nodes may still be catching up, leading to stale reads. This patch introduces a broadcast read barrier mechanism. Calling send_group0_read_barrier_to_live_members after committing will cause the coordinator to send a read barrier RPC to all live nodes (discovered via gossiper) and waits for them to complete. This is best effort attempt to get cluster-wide visibility of the committed state before the response is returned to the user. Auth and service levels write paths are switched to use this new mechanism. Fixes https://scylladb.atlassian.net/browse/SCYLLADB-650 Backport: no, new feature Closes scylladb/scylladb#28731 * https://github.com/scylladb/scylladb: test: add tests for global group0_batch barrier feature qos: switch service levels write paths to use global group0_batch barrier auth: switch write paths to use global group0_batch barrier raft: add function to broadcast read barrier request raft: add gossiper dependency to raft_group0_client raft: add read barrier RPC