@CanIgnoreReturnValue
    public ChainingPrincipalNameTransformer addTransformer(final PrincipalNameTransformer transformer) {
        return addTransformers(List.of(transformer));
    }
Add transformer.

@param transformer the transformer
@return the chaining principal name transformer
core/cas-server-core-util-api/src/main/java/org/apereo/cas/util/transforms/ChainingPrincipalNameTransformer.java