New Sink: PushOver

[Ph3nol]

[arikalon1]

Thank you for reporting it @Ph3nol

Can you describe a little the need to get the notifications on PushOver?

Can Telegram sink be useful to you? https://docs.robusta.dev/master/catalog/sinks/telegram.html#telegram

We also used the Webhook sink and ntfy.sh to push notifications https://docs.robusta.dev/master/catalog/sinks/webhook.html#webhook