[BottomNavigationView] navigationBarColor should match BottomNavigationView's container color

[postfixNotation]

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Is your feature request related to a problem? Please describe. I recently replaced my OnePlus 3T with an 8T which is why there's some space and a handle below the BottomNavigationView. Especially in dark theme these both colors don't match. The display is rounded around the corners.

Describe the solution you'd like I expect the library to set navigationBarColor to be the same value as BottomNavigationView's container color which isn't straight forward since there's an elevation with respect to BottomNavigationView, so simply setting navigationBarColor doesn't solve the issue client side.

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