adds ability to set hint on Parse.Query #6288 (#6322)

* added hint to aggregate

* added support for hint in query

* added else clause to aggregate

* fixed tests

* updated tests

* Add tests and clean up

* Add support for explain

Co-authored-by: Diamond Lewis <findlewis@gmail.com>

src/Routers/ClassesRouter.js

@@ -173,6 +173,8 @@ export class ClassesRouter extends PromiseRouter {
       'readPreference',
       'includeReadPreference',
       'subqueryReadPreference',
+      'hint',
+      'explain',
     ];
 
     for (const key of Object.keys(body)) {
@@ -219,6 +221,15 @@ export class ClassesRouter extends PromiseRouter {
     if (typeof body.subqueryReadPreference === 'string') {
       options.subqueryReadPreference = body.subqueryReadPreference;
     }
+    if (
+      body.hint &&
+      (typeof body.hint === 'string' || typeof body.hint === 'object')
+    ) {
+      options.hint = body.hint;
+    }
+    if (body.explain) {
+      options.explain = body.explain;
+    }
     return options;
   }