Split tabs in the essential arease

[felipenmoura]

In ARC browser, we can do this and it is very useful, specially when you have a wide screen and can split the window into two tabs (the perfect use case for split tabs, actually).

See the screenshot.

When you select, in the essentials aria, a tab set, it goes to the split screen with the two tabs selected.
That's specially useful for chat tabs for example.