public ModelAssembler discoverModels(ClassLoader loader) {
        return addDiscoveredModels(ModelDiscovery.findModels(loader));
    }
Discovers models by merging in all models returns by {@link ModelDiscovery}
manifests using the provided {@code ClassLoader}.

@param loader Class loader to use to discover models.
@return Returns the model assembler.
smithy-model/src/main/java/software/amazon/smithy/model/loader/ModelAssembler.java