#### What type of PR is this?
/area console
/kind improvement
/milestone 2.12.x
#### What this PR does / why we need it:
将默认编辑器依赖添加到插件构建库的 external 中,基于 https://github.com/halo-dev/halo/pull/4924
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/kind cleanup
/area core
#### What this PR does / why we need it:
Bump versions to 2.12.0-SNAPSHOT for next development.
#### Does this PR introduce a user-facing change?
```release-note
None
```