1.8.0版本XA模式如何支持达梦数据库

- [ ] I have searched the [issues](https://github.com/seata/seata/issues) of this repository and believe that this is not a duplicate.

### Ⅰ. Issue Description
1.8.0版本XA模式如何支持达梦数据库，以及其它支持XA的数据库

### Ⅱ. Describe what happened

If there is an exception, please attach the exception trace:

```
Just paste your stack trace here!
```

### Ⅲ. Describe what you expected to happen

### Ⅳ. How to reproduce it (as minimally and precisely as possible)

1. xxx
2. xxx
3. xxx

Minimal yet complete reproducer code (or URL to code):

### Ⅴ. Anything else we need to know?

### Ⅵ. Environment:

- JDK version(e.g. `java -version`):
- Seata client/server version:
- Database version:
- OS(e.g. `uname -a`):
- Others:

No file, test, entry point, or reproducer is provided. Start by locating Seata 1.8.0's XA database integration and existing XA database support, then define a minimal Dameng validation path and document the compatibility requirements for other XA-capable databases.

Written by the indexing model from the issue text.