[NEW] Broadcast Channels

[ggazzo]

@RocketChat/core
closes #9556

[graywolf336]

Can we please create a new room type of broadcast instead of polluting these methods. The room types api was intentionally changed for these style of changes.

[ggazzo]

I will take a look. @graywolf336

[sampaiodiego]

@graywolf336 I think for this case we need a new property instead of a new room type, because we thought cool having the ability to chose within a public or private broadcast room, so this way we're using all validations already implemented.

edit: ok looking at the final code I got you meant @graywolf336 😁 it is still a new room property but is using roomTypes methods 👍

[sampaiodiego]

Looks like public broadcast channels does not work.

I'll make sure to create an issue to do the changes requested.