default Optional<String> getDefaultValueFromSysProp() {
        String value = System.getProperty(getSystemProperty());
        if (value != null) {
            value = value.trim();
        }
        return Optional.ofNullable(value);
    }
Gets trimmed default value from system property. By default the system
property is named as {@link #getPrefix()} + "_" + {@link #name()} in lower
case.

@return trimmed default value defined in system property
clickhouse-data/src/main/java/com/clickhouse/config/ClickHouseOption.java