Support DML for global tables
As far as we already support DQL for global distribution nodes, its time to add DML as well. We should use CAS as we do now for ACL/DDL. CAS should be executed the router under most cases, but we can also do it on the storage when we read from a single instance of the sharded table.
There is a problem of the raft log pollution when we insert lots of records with DML as we dispatch via raft it in a per-tuple manner (look at the attached issues).
Edited by Denis Smirnov