Get rid of Guava

[berezovskyi]

The less deps the better - less updating and CVE surface. We are only using string and immutable list utils.

For the lists, new JDKs have:

• Collections.unmodifiableList(list);
• List.of(...)

For strings, I have a small utils class:

class StringUtils {
    private static final Pattern CONTROL_CHAR_PATTERN = Pattern.compile("^\\p{Cc}&&[^\\r\\n\\t]+$");

    /**
     * Trim and strip control chars
     */
    public static String clean(String str) {
        if (str == null) return null;

        return CONTROL_CHAR_PATTERN.matcher(str).replaceAll("").trim();
    }

    /**
     * Trim and strip control chars; return an empty string if a null is encountered
     */
    public static String cleanNonNull(String str) {
        if (str == null) return "";

        return CONTROL_CHAR_PATTERN.matcher(str).replaceAll("").trim();
    }

    public static boolean isNullOrWhitespace(String str) {
        return str == null || str.isBlank();
    }


    public static boolean isNullOrEmpty(String str) {
        return str == null || str.isEmpty();
    }
}

[berezovskyi]

and of commons-lang(3):

org.eclipse.lyo.server.ui.model.PreviewFactory uses StringUtils.isBlank