feat: new MapControl component

[usefulthink]

Adds a new component MapControl that allows users to add custom react components to the controls of a Map instance.

Example:

import {APIProvider, Map, MapControl, ControlPosition} from '@vis.gl/react-google-maps';

const App = () => (
  <APIProvider apiKey={'...'}>
    <Map {...mapProps}>
      <MapControl position={ControlPosition.TOP_LEFT}>
          .. any component here will be added to
             the control-containers of the google map instance ..
      </MapControl>
    </Map>
  </APIProvider>
);