Notifications without Google Play services

### Your use case

#### What would you like to do?
have notifications as with the old version of the app.
#### Why would you like to do it?
I'm not using Google Play services.
#### How would you like to achieve it?
The same way it was done within the old app.

### Have you considered any alternatives?

Will it be possible to use Element-X without Google Play services?

### Additional context

_No response_

### Are you willing to provide a PR?

No