whaon

强烈建议增加nacos为注册中心时的文档

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找了半天 admin.registry.address=nacos://127.0.0.1:8848 admin.config-center=nacos://127.0.0.1:8848 admin.metadata-report.address=nacos://127.0.0.1:8848 #group admin.registry.group=DEFAULT_GROUP admin.config-center.group=DEFAULT_GROUP admin.metadata-report.group=DEFAULT_GROUP #namespace used by nacos admin.registry.namespace=public admin.config-center.namespace=public admin.metadata-report.namespace=public 增加上述配置，可以在admin中看到，但又出现： **无元数据信息，请升级至Dubbo2.7及以上版本，或者查看application.properties中关于config center的配置，详见 这里** 这个到底要怎么配置 @justinmclean @nzomkxia

对DataSource做增强，升级flex版本到1.11.0后失效，还原恢复

support @GlobalTransactional and @GlobalLock in parent class and interface

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- [ ] I have read the [CONTRIBUTING.md](https://github.com/apache/incubator-seata/blob/2.x/CONTRIBUTING.md) guidelines. - [ ] I have registered the PR [changes](https://github.com/apache/incubator-seata/tree/2.x/changes). ### Ⅰ. Describe what this PR did support `@GlobalTransactional` and `@GlobalLock` in...

### Check Ahead - [x] I have searched the [issues](https://github.com/seata/seata/issues) of this repository and believe that this is not a duplicate. - [x] I am willing to try to implement...