add script for meta migration

core/scripts/migration/mysql_6_to_4.sql

+alter table Tables drop column owner_table;
+alter table Tables drop column partition_tag;
+alter table Tables drop column version;

core/scripts/migration/sqlite_6_to_4.sql

+CREATE TABLE 'TempTables' ( 'id' INTEGER PRIMARY KEY NOT NULL , 'table_id' TEXT UNIQUE NOT NULL , 'state' INTEGER NOT NULL , 'dimension' INTEGER NOT NULL , 'created_on' INTEGER NOT NULL , 'flag' INTEGER DEFAULT 0 NOT NULL , 'index_file_size' INTEGER NOT NULL , 'engine_type' INTEGER NOT NULL , 'nlist' INTEGER NOT NULL , 'metric_type' INTEGER NOT NULL);
+
+INSERT INTO TempTables SELECT id, table_id, state, dimension, created_on, flag, index_file_size, engine_type, nlist, metric_type FROM Tables;
+
+DROP TABLE Tables;
+
+ALTER TABLE TempTables RENAME TO Tables;