-  id is pub.name. name in lower case.
- use id to match sync installed extension with gallery extension
- use id to identify extension while installing and uninstalling
- Clean up
- Remove IExtensionIdentity
- Add util methods to create gallery id and local extension id

- Include extension specific properties only
- Refactor: Move extensions scanning to MainThreadExtensionService

- Enable / Disable actions show the current state
- Reload only when it is necessary and applied changes have impact.
- Blur the extension only when it is installed and not activated
- Improve messages for reload
- Remove status widget

fixes #14384

second attempt

related to #13415