Add examples constant to temp storage keys

Author: MaggieKimani1

src/Microsoft.OpenApi.Readers/V2/TempStorageKeys.cs

@@ -17,5 +17,6 @@ internal static class TempStorageKeys
         public const string GlobalConsumes = "globalConsumes";
         public const string GlobalProduces = "globalProduces";
         public const string ParameterIsBodyOrFormData = "parameterIsBodyOrFormData";
+        public const string Examples = "examples";
     }
 }