title: createMaterialTopTabNavigator with position bottom shifts up with keyboard
body: <p>I am having difficulty in preventing my tabs from shifting up with the keyboard. I want the screens to "slide" in from the left or right when the tab is changed, and swiping on the screen to be able to change tabs and I found <a href="https://stackoverflow.com/questions/53197395/swiping-between-tabs-using-creatematerialbottomtabnavigator-for-android">this</a> so I used the <code>createMaterialTopTabNavigator</code> with <code>tabBarPosition: 'bottom'</code>. But the tab bar now moves up with the keyboard.</p>
  
  <p>I also looked up on <a href="https://reactnavigation.org/docs/en/transitioner.html" rel="nofollow noreferrer">transitioners</a> but I found it too complex for my understanding. Is there any easy alternative way to prevent the tabs from moving upward with the keyboard?</p>