[Nacos 3.0] Enhance default namespace id from `` to `public` phase 2.

[KomachiSion]

In Nacos 3.0 Alpha, community finished to enhance namespace id from `` to public to solve #9846.

But in Alpha version, there is one problem that can't upgrade from old version. The reason is old version has store config with `` namespaceId in datasource.

For solve this problem, community plan upgrade datasource plugin to adapt this situation by auto-change public input to when plugin will handle datasource (such as publish, delete and update), and auto-change to public when do search in datasource.

So sub tasks follow:

• [x] Adapt old version datum for MySQL datasource plugin
• [x] Adapt old version datum for Derby datasource plugin
• [ ] Adapt old version datum for datasource plugins in nacos-group

[Bo-Qiu]

Please assign to me, thx.

[KomachiSion]

@Bo-Qiu any more response or new PR?