SEATA支持建表语句的全局事务

目前SEATA在Mysql只支持INSERT，UPDATE，DELETE，SELECT_FOR_UPDATE这四种语句的全局事务
分库分表业务需要动态创建数据库表，希望下个版本能支持建表语句的全局事务

The issue requests MySQL CREATE TABLE support in global transactions for sharding workloads. Start by tracing how Seata handles INSERT, UPDATE, DELETE, and SELECT_FOR_UPDATE, then locate the related transaction and regression-test entry points. Done means CREATE TABLE is covered by equivalent global-transaction behavior with tests.

Written by the indexing model from the issue text.