Add Google Maps integration and update UI components; change platform version and minimum SDK

ios/Runner/AppDelegate.swift

@@ -1,5 +1,6 @@
 import Flutter
 import UIKit
+import GoogleMaps
 
 @main
 @objc class AppDelegate: FlutterAppDelegate {
@@ -7,6 +8,7 @@ import UIKit
     _ application: UIApplication,
     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
   ) -> Bool {
+    GMSServices.provideAPIKey("AIzaSyDoflpihvRWaQx18SKMu8_fgirF0muW4yU")
     GeneratedPluginRegistrant.register(with: self)
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }