feat: enable asynchronous resolving for UI extension points

[ruibaby]

What type of PR is this?

/area ui
/kind feature
/milestone 2.16.x

What this PR does / why we need it:

优化 UI 部分的扩展点获取实现，让部分扩展点支持异步获取，之前的实现与文档不符。

比如：

import { definePlugin } from "@halo-dev/console-shared";
import axios from "axios";

export default definePlugin({
  components: {},
  routes: [],
  extensionPoints: {
    "attachment:selector:create": async () => {
      const { data } = await axios.get(
        "/apis/v1alpha1/fake.halo.run/attachments/selectors"
      );

      return data;
    },
  },
});

Which issue(s) this PR fixes:

Fixes #6008

Does this PR introduce a user-facing change?

优化 UI 部分的扩展点获取实现，让部分扩展点支持异步获取。

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.13%. Comparing base (5fdf6c0) to head (174daea).
Report is 216 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6018      +/-   ##
============================================
- Coverage     56.91%   56.13%   -0.78%     
- Complexity     3319     3515     +196     
============================================
  Files           587      621      +34     
  Lines         18968    20915    +1947     
  Branches       1401     1460      +59     
============================================
+ Hits          10795    11740     +945     
- Misses         7594     8582     +988     
- Partials        579      593      +14     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[guqing]

/lgtm

[JohnNiang]

/approve

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• ui/OWNERS [JohnNiang]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment