[Feature request] Display volume notifications only from hotkeys

Currently we always get volume notifications (source and sink). It can be annoying when application (e.g. Slack) is changing the microphone volume - we get a lot of volume notification during a call.

The idea is to display volume notifications only when we use hotkeys to mute/unmute on change volume for both source and sink.

What do you think? Does it need additional option in UI or the logic can be just replaced?