Support auto-raise/focus-pull when clicking system notifications on Plasma/KDE

### Your use case

#### What would you like to do?
I would like to be able to raise the Element window to the foreground upon clicking a notification of a new message. Whether this works for minimized window is optional, or should be configurable.

#### Why would you like to do it?
It is convenient to move the mouse to a notification when reading it, and click it to bring the chat to the foreground to reply to the message.

#### How would you like to achieve it?
Electron supports the xdg_activation_v1 protocol, so this should be easy to implement.

### Have you considered any alternatives?

_No response_

### Additional context

_No response_