Why you need it?

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Add AT transaction mode tests to support database data types (PostgreSQL)
增加 AT事务模式中对数据库数据类型的测试，当前任务针对PostgreSQL

The purpose of the test case is to verify that the COMMIT and ROLLBACK are correct
测试case目的是验证commit和rollback的正确性

Code can be submitted on the https://github.com/seata/seata-test or https://github.com/seata/seata/tree/develop/test
提交的代码可以放到 https://github.com/seata/seata-test 或 https://github.com/seata/seata/tree/develop/test

In this issue, tasks will be disassembled according to the classification of data types.
这个issue中会按照数据类型做分类拆解，按找数据类型的分类进行任务的拆解。

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