Add Polygon Type To Schema / PolygonContain to Query (#3944)

* Added type polygon to schema

* refactoring and more tests

* fix tests

* update test and transform

* add support for polygonContains

* fix transform.mongoObjectToParseObject test

* add indexes for polygon

* index test

* postgres test fix

* remove invalid loop test

* add invalid loop test

* nit

src/Controllers/SchemaController.js

@@ -231,7 +231,8 @@ const validNonRelationOrPointerTypes = [
   'Array',
   'GeoPoint',
   'File',
-  'Bytes'
+  'Bytes',
+  'Polygon'
 ];
 // Returns an error suitable for throwing if the type is invalid
 const fieldTypeIsInvalid = ({ type, targetClass }) => {
@@ -995,6 +996,11 @@ function getObjectType(obj) {
         return 'Bytes';
       }
       break;
+    case 'Polygon' :
+      if(obj.coordinates) {
+        return 'Polygon';
+      }
+      break;
     }
     throw new Parse.Error(Parse.Error.INCORRECT_TYPE, "This is not a valid " + obj.__type);
   }