add RuleUnitDescription createRuleUnitDescription( KiePackage pkg, String ruleUnitSimpleName ); it should be a no-op because it is only used in Kogito

also RuleUnitDescriptionLoader may use this method in case {{createRuleUnitDescription( KiePackage pkg, Class<?> ruleUnit );} fails. However, this cannot happen in Drools 7, as the RuleUnit is always described by a Class, so it will always return null (it's a no-op after all). Reasons for backport are only code alignment.