public static void registerRocksDBOptions(final Class<?> cls, final DBOptions opts) {
        registerRocksDBOptions(null, cls, opts);
    }
Users can register a custom rocksdb dboptions, then the related
classes will get their options by the key of their own class
name.  If the user does not register an options, a default options
will be provided.
@param cls  the key of DBOptions
@param opts the DBOptions
jraft-core/src/main/java/com/alipay/sofa/jraft/util/StorageOptionsFactory.java