Rework Object's [[OwnPropertyKeys]] (#4001)

I've removed the ecma_op_object_get_property_names method, and implemented the following ones:
- ecma_op_object_own_property_keys: this is now the internal [[OwnPropertyKeys]] method
- ecma_op_object_enumerate: this is used for the for-in iterator
- ecma_object_sort_property_names: this is used for sorting the property names of an object
- ecma_object_list_lazy_property_names: this is for getting the lazy instantiated properties
- ecma_object_prop_name_is_duplicated: this is for checking if a given property is duplicated in an object

Also the for-in operation with Proxy object works with this patch, #3992 should be closed

JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

jerry-core/ecma/operations/ecma-array-object.h

@@ -90,7 +90,7 @@ uint32_t
 ecma_delete_fast_array_properties (ecma_object_t *object_p, uint32_t new_length);
 
 ecma_collection_t *
-ecma_fast_array_get_property_names (ecma_object_t *object_p, uint32_t opts);
+ecma_fast_array_object_own_property_keys (ecma_object_t *object_p);
 
 void
 ecma_fast_array_convert_to_normal (ecma_object_t *object_p);
@@ -121,12 +121,6 @@ uint32_t ecma_array_get_length (ecma_object_t *array_p);
 ecma_value_t
 ecma_array_object_to_string (ecma_value_t this_arg);
 
-void
-ecma_op_array_list_lazy_property_names (ecma_object_t *obj_p,
-                                        uint32_t opts,
-                                        ecma_collection_t *main_collection_p,
-                                        ecma_collection_t *non_enum_collection_p);
-
 /**
  * @}
  * @}