android: move calendar permission handling to the SDK

Since this is a feature implemented in the SDK, it makes sense that all the
plumbing required to make it work it's in the SDK itself.

android/app/src/main/java/org/jitsi/meet/MainActivity.java

 import org.jitsi.meet.sdk.invite.InviteController;
 import org.jitsi.meet.sdk.invite.InviteControllerListener;
 
-import com.calendarevents.CalendarEventsPackage;
 import com.facebook.react.bridge.UiThreadUtil;
 
 import java.util.ArrayList;
-import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
             addPeopleController.endAddPeople();
         }
     }
-
-    @Override
-    public void onRequestPermissionsResult(
-            int requestCode,
-            String[] permissions,
-            int[] grantResults) {
-        CalendarEventsPackage.onRequestPermissionsResult(
-            requestCode,
-            permissions,
-            grantResults);
-
-        super.onRequestPermissionsResult(
-            requestCode,
-            permissions,
-            grantResults);
-    }
 }

android/sdk/src/main/java/org/jitsi/meet/sdk/ReactActivityLifecycleCallbacks.java

         final int requestCode,
         final String[] permissions,
         final int[] grantResults) {
+        CalendarEventsPackage.onRequestPermissionsResult(
+            requestCode,
+            permissions,
+            grantResults);
         permissionsCallback = new Callback() {
             @Override
             public void invoke(Object... args) {