private ModelAssembler addDiscoveredModels(List<URL> urls) {
        for (URL url : urls) {
            LOGGER.fine(() -> "Discovered Smithy model: " + url);
            addImport(url);
        }

        return this;
    }
Discovers models by merging in all models returns by {@link ModelDiscovery}
manifests using the thread context {@code ClassLoader}.

@return Returns the model assembler.
smithy-model/src/main/java/software/amazon/smithy/model/loader/ModelAssembler.java