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bf115e7d69
We use a custom sharder for all schema tables: every table under the `system_schema` keyspace, plus `system.scylla_table_schema_history`. This sharder puts all data on shard 0. To achieve this, we hardcode the sharder in initial schema object definitions. Furthermore - since the sharder is not stored inside schema mutations yet - whenever we deserialize schema objects from mutations, we modify the sharder based on the schema's keyspace and table names. A regression test is added to ensure no one forgets to set the special sharder for newly added schema tables. This test assumes that all newly added schema tables will end up in the `system_schema` keyspace (other tables may go unnoticed, unfortunately). Closes #7947