private static void assertNotNull(Object... objects) {
        for (Object o : objects) {
            assert(o != null);
        }
    }
@param allChainSpecifications resolves ChainSpecifications from ComponentSpecifications
                              as given in the inheritance fields.
@param path tracks which chains are used in each recursive invocation of flatten, used for detecting cycles.
@return ChainSpecification directly containing all the component references and phases of the inherited chains.
container-core/src/main/java/com/yahoo/component/chain/model/ChainSpecification.java