[<a href="#Go_1.27">Go 1.27</a>] for a (possibly promoted) field
	    of the struct; the key selects that field.
	</li>
	<li>The types of the embedded fields (if any) <a href="#Selectors">traversed</a>
	    to reach a selected field must not be pointer types.
	</li>
	<li>A key must not denote a promoted field inside an embedded struct if
	    that struct is also specified by another key.
	</li>

- Users can traverse all the pods that are in the scheduler and waiting in the permit stage through method `IterateOverWaitingPods`. In other words,  all waitingPods in scheduler can be obtained from any profiles. Before this commit, each profile could only obtain waitingPods...