show the critical updates seperate from other updates and show change log

## Prerequisites
- [ yes] I have searched open and closed issues for duplicates.

## Feature
**Is your feature request related to a problem? Please describe.**

the is no way to know about critical updates, all updates simply in Operating System Updates and there is no way to know about Operating System Updates Changelog.

**Describe the solution you'd like**

add some part in Operating System Updates part to show critical updates (like kernel security updates and all security and critical bugfix) and separate from other source add by user(ppa, etc) like critical part and non critical part.

also users tired looking on cold Operating System Updates part(because just show you updates there is no changelog) it's very important to show users change log for Operating System Updates apps and change UI to readable for users.
**Existing work**

yes, ubuntu have this system in updates app.
**Describe alternatives you've considered**

i don't know
**Additional context**