feat: display otp notifications with sound when app is already open

[guilhermelimak]

Closes #828.

[simoneb]

Not entirely sure this will work fully because I would have expected to find a different configuration for the app when it's in the foreground and when it's in the background, or iow, even though they were false, both the sound and the badge (whatever it is) I believe were played with the app in the background, but not in the foreground. Anyway, this doesn't look like it'll do any damage so let's merge it and see what happens I guess

[guilhermelimak]

Not entirely sure this will work fully because I would have expected to find a different configuration for the app when it's in the foreground and when it's in the background, or iow, even though they were false, both the sound and the badge (whatever it is) I believe were played with the app in the background, but not in the foreground. Anyway, this doesn't look like it'll do any damage so let's merge it and see what happens I guess

From the docs it seems like the notification handler is only used when the app is running. I also tested a couple of times to make sure it worked so I'm pretty confident.