Use a dataid to store all configuration items

## Why you need it?
Use a dataid to store all configuration items
If you want to fix it, please comment "Please assign it to me" is this issue.

使用一个dataid存放所有配置项
如果你有兴趣修复这个问题的话, 请在下方留言 Please assign it to me

## How it could be?
A clear and concise description of what you want to happen. You can explain more about input of the feature, and output of it.

## Other related information
Add any other context or screenshots about the feature request here.

The issue names no files, tests, or entry points, so first locate the configuration-storage implementation and its existing tests in Seata. Clarify the intended dataid format, configuration scope, and migration or compatibility requirements; the work is done when all configuration items use the agreed single dataid and the relevant tests pass.

Written by the indexing model from the issue text.