Method to retrieve an alternate AuthorizationCheckerFactory when the current AuthorizationChecker is required to process a nested AuthzRequest of a different type.
AuthzRequests can nest other AuthzRequests of different types internally. When an
AuthorizationChecker
finds a nested request of a different type from which it was coded to process, it uses the
AuthorizationCheckerFactory
to retrieve an alternate
AuthorizationChecker
it can chain to process the nested request.
The factory for producing Authorization Checkers