add filter for notifications panel

### Your use case

#### What would you like to do?
the overview over all notifications is pretty powerful. it could be enhanced by adding filters not unlike threads (which have "all" or "my")

#### How would you like to achieve it?
filter by mention, pill (explicit mention), room ping, reply, thread, keyword(s), all rooms and spaces, single rooms, single spaces, ....

### Have you considered any alternatives?

_No response_

### Additional context

_No response_