add plugin: astrbot_plugin_combine-messages

[anka-afk]

好的，这是翻译成中文的 pull request 总结：

Sourcery 总结

新特性：

• 在插件配置中引入 astrbot_plugin_combine-messages

Original summary in English

Summary by Sourcery

New Features:

• Introduce astrbot_plugin_combine-messages to the plugins configuration

[sourcery-ai]

## 审查者指南

此 pull request 通过将 `astrbot_plugin_combine-messages` 的配置添加到 `plugins.json` 文件中来注册新的插件。

### 文件级别变更

| 变更        | 详情

<details>
<summary>Original review guide in English</summary>

## Reviewer's Guide

This pull request registers the new `astrbot_plugin_combine-messages` plugin by adding its configuration to the `plugins.json` file.

### File-Level Changes

| Change | Details | Files |
| ------ | ------- | ----- |
| Register the new plugin | <ul><li>Added configuration entry for `astrbot_plugin_combine-messages`.</li></ul> | `plugins.json` |

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</details>

</details>

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[sourcery-ai]

嘿 @anka-afk - 我已经查看了你的更改 - 这里有一些反馈：

• 考虑添加一个描述来解释新插件的用途。
• 此 pull request 中似乎缺少新插件 'astrbot_plugin_combine-messages' 的代码。

以下是我在审查期间查看的内容

• 🟢 一般问题：一切看起来都很好
• 🟢 安全性：一切看起来都很好
• 🟢 测试：一切看起来都很好
• 🟢 复杂性：一切看起来都很好
• 🟢 文档：一切看起来都很好

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Original comment in English

Hey @anka-afk - I've reviewed your changes - here's some feedback:

• Consider adding a description explaining the purpose of the new plugin.
• The code for the new plugin 'astrbot_plugin_combine-messages' seems to be missing from this pull request.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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