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The MIGRATION_REQUEST verb is currently used to pull the contents of schema tables (in the form of mutations) when nodes synchronize schemas. We will (ab)use the verb to fetch additional data, such as the contents of the group 0 history table, for purposes of group 0 snapshot transfer. We extend `schema_pull_options` with a flag specifying that the puller requests the additional data associated with group 0 snapshots. This flag is `false` by default, so existing schema pulls will do what they did before. If the flag is `true`, the migration request handler will include the contents of group 0 history table. Note that if a request is set with the flag set to `true`, that means the entire cluster must have enabled the Raft feature, which also means that the handler knows of the flag.