Allow navigation component items to take badge sub-components

[jayelkaake]

Why?

Sometimes you want to show a a warning badge in the nav to direct people to that location to check some errors, but the current implementation only lets you set a value or nil.

What?

You can still set the value via the item badge attribute, however it will now also check for the sub-component so you can do this to show a critical errors count badge:

item.with_badge(status: :critical) { "1" }