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

android/app/build.gradle.kts

@@ -24,7 +24,7 @@ android {
         applicationId = "com.example.travel_mate"
         // You can update the following values to match your application needs.
         // For more information, see: https://flutter.dev/to/review-gradle-config.
-        minSdk = flutter.minSdkVersion
+        minSdkVersion 21
         targetSdk = flutter.targetSdkVersion
         versionCode = flutter.versionCode
         versionName = flutter.versionName

android/app/src/main/AndroidManifest.xml

@@ -30,6 +30,9 @@
         <meta-data
             android:name="flutterEmbedding"
             android:value="2" />
+        <meta-data
+            android:name="com.google.android.geo.API_KEY"
+            android:value="AIzaSyAAQd5UqtPc0fsbHnuezm22r9b5dgzv21Y"/>
     </application>
     <!-- Required to query activities that can process text, see:
          https://developer.android.com/training/package-visibility and