@Override
    public List<String> determineRequestedAttributeDefinitions(final RegisteredServiceAttributeReleasePolicyContext context) {
        return new ArrayList<>(getAllowedAttributes().keySet());
    }
Return a collection of allowed attributes for the principal, but additionally,
offers the ability to rename attributes on a per-service level.

@author Misagh Moayyed
@since 4.1.0
core/cas-server-core-authentication-attributes/src/main/java/org/apereo/cas/services/ReturnMappedAttributeReleasePolicy.java