title: How to get bounds of visible map with flutter google_maps plugin?
body: <p>I'm trying to find out what is the bounding box of the visible part of google map in flutter's google maps plugin.</p>
  
  <p>Is it possible to get it? </p>
  
  <p>If not is it possible to calculate the bounding box based on zoom level and latitude, longitude of the map center?</p>