[NEW] Continuous sound notifications for new LiveChat rooms

[renatobecker-zz]

@RocketChat/core

Closes #9847

This PR adds a new feature that allows to send continuous sound notifications when a new Livechat message arrives.
This means that the Livechat agent will hear sound notifications while there is a room with at least one unread message.

[sampaiodiego]

the "new room sound" is playing for every new message (exactly what the setting says) but the issue is talking about playing the "new room sound" continuously only for new rooms and not new messages

[renatobecker-zz]

@sampaiodiego, thanks for your feedback.
What happened here is that @theorenck and I had a conversation before starting this PR, and at that time, we thought that the "new room sound" notification should be played for each new LiveChat message.
Sorry for my mistake, I'll fix this to work the expected way.

[renatobecker-zz]

Fixed PR review.

[geekgonecrazy]

@rocketchat/core does anyone know... If this isn't unset does it keep executing? Or does the meteor wrapper here work just like normal setTimeout?

[renatobecker-zz]

There is an issue in this PR that needs to be reviewed.
When a new room is created, the sound notification is played correctly.
But if another room gets focus, even if there are unread rooms, the sound is paused.
So I'm going to work on this to make it work as expected.

[renatobecker-zz]

New room sound notification was being paused when any room got focus.
This was happening because of this:

https://github.com/RocketChat/Rocket.Chat/blob/develop/packages/rocketchat-ui/client/lib/notification.js#L123

Now it's fixed.

to old

[ggazzo]

too* :)

[ggazzo]

😘