#### What type of PR is this?
/kind feature
/area core
/area plugin
#### What this PR does / why we need it:
This PR adds property sources into PluginApplicationContext environment to support configuration properties mechanism.
See https://github.com/halo-dev/halo/issues/4015 for more.
#### Which issue(s) this PR fixes:
Fixes https://github.com/halo-dev/halo/issues/4015
#### Special notes for your reviewer:
You can verify the mechanism in [plugin-starter](https://github.com/halo-dev/plugin-starter) according to documentation `docs/developer-guide/plugin-configuration-properties.md`.
I've only tested it on macOS, looking forward to feedback on Windows.
#### Does this PR introduce a user-facing change?
```release-note
支持在插件中定义 @ConfigurationProperties 注解
```
#### What type of PR is this?
/kind improvement
/kind api-change
/area core
/milestone 2.0
#### What this PR does / why we need it:
- 修改管理后台使用的自定义 API 的 group 为 `api.console.halo.run`
- 面向三方应用的自定义 API 的 group 为 `api.halo.run`
- 插件的自定义 API 的 group 为 `api.plugin.halo.run`
#### Which issue(s) this PR fixes:
Fixes#2418
#### Special notes for your reviewer:
/cc @halo-dev/sig-halo
#### Does this PR introduce a user-facing change?
```release-note
None
```
John Niang