add tabbar height props instead of default

[congnguyen91]

• I am using react-native-navigation with bottomTabs with a long form. When the keyboard is visible, the topBar is hidden.
  So I fixed this with tabBarHeight props (a new props instead of the default)

const _KAM_DEFAULT_TAB_BAR_HEIGHT: number = isIphoneX() ? 83 : 49

).

My solution:

import { hasNotch } from 'react-native-device-info';
...
 <KeyboardAwareScrollView
          viewIsInsideTabBar={true}
          tabBarHeight={hasNotch() ? 83 : 64}
          ...