public static <T> ExtensionLoader<T> getExtensionLoader(final Class<T> clazz) {
        return getExtensionLoader(clazz, ExtensionLoader.class.getClassLoader());
    }
Gets extension loader.

@param <T>   the type parameter
@param clazz the clazz
@return the extension loader
shenyu-spi/src/main/java/org/apache/shenyu/spi/ExtensionLoader.java