Refactor menu generation strategy to support sub-menu items.

[ruibaby]

What type of PR is this?

/area console
/kind feature
/milestone 2.12.x

What this PR does / why we need it:

重构 Console 和 UC 的菜单生成逻辑，支持配置二级菜单项。

配置方式：

export default definePlugin({
  components: {},
  routes: [
    {
      parentName: "AttachmentsRoot",
      route: {
        name: "S3Link",
        path: "s3-link",
        component: markRaw(HomeView),
        meta: {
          title: "S3 关联",
          searchable: true,
          menu: {
            name: "S3 关联",
            icon: markRaw(IconAddCircle),
            priority: 0,
            mobile: true,
          },
        },
      },
    },
  ],
});

只需要指定 parentName 并在其下 route 需要配置 meta.menu 即可。

最终文档会补充在：halo-dev/docs#291

Which issue(s) this PR fixes:

Fixes #4807

Special notes for your reviewer:

1. 可以按照上述配置方式测试。
2. 可以安装 plugin-s3-1.5.0-SNAPSHOT.jar.zip 进行测试。

Does this PR introduce a user-facing change?

重构 Console 和 UC 的菜单生成逻辑，支持配置二级菜单项。

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (86e688a) 55.98% compared to head (ba14a16) 55.98%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #5177   +/-   ##
=========================================
  Coverage     55.98%   55.98%           
  Complexity     3027     3027           
=========================================
  Files           538      538           
  Lines         17973    17973           
  Branches       1319     1319           
=========================================
  Hits          10062    10062           
  Misses         7367     7367           
  Partials        544      544           

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[guqing]

/lgtm

[JohnNiang]

/approve

It works very well.

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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• console/OWNERS [JohnNiang]

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