feat: add update subscription with cron job support

[EkkoG]

Background

For now, subscription cannot be updated after it be added, this PR add ability update subscription with a cron job, frontend can add a dialog to let users fill a cron job expression or a duration like update per hour.

Checklist

• The Pull Request has been fully tested
• There's an entry in the CHANGELOGS
• There is a user-facing docs PR against https://github.com/daeuniverse/dae-wing

Full Changelogs

• Support update subscription with cron job

Issue Reference

no

Test Result

[sumire88]

@EkkoG Would you like to propose the required changes in daed as well?

[EkkoG]

daed need add some interface to allow user set cron expression or frequency of update task to run, like every 6 hours, I'm not familiar with daed so I cannot pr to daed for now.

[wanlce]

@EkkoG 目前此PR虽然可以实现自动更新订阅，但是订阅更新后仍需手动 reload 或者重启之后才可以生效（
用以下逻辑来替代怎么样，这样前端好改

• reload 操作会先更新订阅
• 添加自动 reload 的开关和 Cron Expression

这样就完成了自动订阅更新并生效了