Reactions to messages should cause a notification

### Your use case

#### What would you like to do?

Currently, one can turn on notifications for group chat messages, direct messages, and mentions. However, if somebody reacts to a message, no notification is triggered. It would be nice if one could also turn on notifications for reactions.

#### Why would you like to do it?

Because otherwise, one only sees reactions after opening the respective chat and seeing them. If somebody reacts to a message not located on the screen anymore, one would have to scroll and search – and most probably, one misses the reaction.

#### How would you like to achieve it?

By adding another settings switch for enabling notifications on reactions.

Thanks in advance for possibly considering this!

### Have you considered any alternatives?

Well, the alternative would be to keep on missing reactions ;-)

### Additional context

_No response_

### Are you willing to provide a PR?

No