feat: support cell restore executing msg

[HellowVirgil]

Description

Please include a summary of the changes and the motivation behind them. Also, include any relevant context or links to related issues.

Type of Change

Please mark the type of change:

• Bug fix
• New feature
• Documentation update
• Code refactoring
• Other (please describe):

Related Issues

Please list any issues related to this pull request (e.g., Fixes #123, Closes #456).

Testing

Please describe the tests that were performed to verify your changes. Include details about the testing framework, if applicable.

• Unit tests
• Integration tests
• Manual testing

Checklist

• My code follows the project’s coding style.
• I have updated the documentation as necessary.
• I have added tests to cover my changes.
• All new and existing tests pass.
• My changes require a change to the documentation.

Additional Notes

默认情况下，Cell 的“正在运行”状态和消息监听是保存在前端组件的内存中的。当页面刷新或组件重新加载时，内存数据丢失，虽然 Kernel 后端还在跑任务，但前端已经不知道是谁在跑，导致 UI 显示为静止，且无法接收后续的输出。

本 PR 将每次执行请求的唯一标识符 ( msg_id ) 写入到 Cell 的 metadata 中，在刷新页面后，根据存储的 msg_id 去 Kernel 的广播频道里认领属于这个 Cell 的消息，并恢复 output 输出。