Replace toastr with Ant component

[arikfr]

• Pick Ant component to use (<Notification> or <Message>, maybe both?).
• Replace calls to toastr with one of the above.
• Remove angular-toastr from dependencies.

[kravets-levko]

I think <Notification> is a direct replacement for angular-toastr. Also, IMO it's less annoying - Message is always shown on middle-top part of screen and therefore attracts more attention (especially when there are 2-3 messages at the same time - sometimes it happens in Redash).

[arikfr]

It seems that Notification is supposed to be used with lighter messages like "Query Saved" while Notification is for longer stuff, like -- "Test Connection failed, here's the details: ...".

But if Notification "works" with short content as well, then probably best to have only one.