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a483915c62
Add a new virtual table `system.raft_state` that shows the currently operating Raft configuration for each present group. The schema is the same as `system.raft_snapshot_config` (the latter shows the config from the last snapshot). In the future we plan to add more columns to this table, showing more information (like the current leader and term), hence the generic name. Adding the table requires some plumbing of `sharded<raft_group_registry>&` through function parameters to make it accessible from `register_virtual_tables`, but it's mostly straightforward. Also added some APIs to `raft_group_registry` to list all groups and find a given group (returning `nullptr` if one isn't found, not throwing an exception).