public static OptionBuilder key(String key) {
        checkNotNull(key);
        return new OptionBuilder(key);
    }
Starts building a new {@link ConfigOption}.

@param key The key for the config option.
@return The builder for the config option with the given key.
inlong-sort/sort-common/src/main/java/org/apache/inlong/sort/configuration/ConfigOptions.java