Specifies the theme color of the BottomNavigationThemeColor. (see example).
The possible values are:
base(Default) — Applies base coloring.primary— Applies coloring based on the primary theme color.secondary— Applies coloring based on the secondary theme color.tertiary— Applies coloring based on the tertiary theme color.inverse— Applies coloring based on the inverted theme color.
Possible values:
"base""primary""secondary""tertiary""inverse"