[5.6] Add broadcastAs method to Broadcasted Notifications

[antonkomarev]

Uses Notification's broadcastAs() return value for Event name and broadcasted message type if method exists.

I found it useful because of 2 things:

1. It doesn't couple your back-end application class namespace with front-end, otherwise if you will decide to refactor namespace on back-end - you will require to reflect this changes on front-end too.
2. It will allow us to have same behavior for Broadcasted Events nor Broadcasted Notification Events.

[antonkomarev]

By second commit I've added broadcastsAs method to DatabaseChannel to keep consistency, but later understood that's not broadcasting and this method name is wrong, and reverted it back.

[lipiniak]

Hi, is there any chance that this will be implemented to database? I got problem with that because i wont to cross use notification in models. Like Model A send notification to Model B but in database notification type is Model A, so Model B cant see it using $model->notifications method.

[antonkomarev]

@lipiniak with this change #23337 you can create extended DatabaseChannel and use it in your application. Just overwrite type attribute there.

[ClaudioVarandas]

Hi, the commit 6f28b66 is merged or not ? seems not merged, at least i don't that on any 5.6/5.7 tag...
@taylorotwell can you please clarify ?

tx

[devcircus]

@kadinho the method was renamed here: 4227bd7