Add utility method to parse an IP to BytesRef (#95291)

This adds a QL utility method that parses an IP address into a BytesRef
object.

x-pack/plugin/ql/src/main/java/org/elasticsearch/xpack/ql/util/StringUtils.java

@@ -6,9 +6,12 @@
  */
 package org.elasticsearch.xpack.ql.util;
 
+import org.apache.lucene.document.InetAddressPoint;
 import org.apache.lucene.search.spell.LevenshteinDistance;
+import org.apache.lucene.util.BytesRef;
 import org.apache.lucene.util.CollectionUtil;
 import org.elasticsearch.common.Strings;
+import org.elasticsearch.common.network.InetAddresses;
 import org.elasticsearch.core.Tuple;
 import org.elasticsearch.search.builder.SearchSourceBuilder;
 import org.elasticsearch.xcontent.ToXContent;
@@ -322,6 +325,11 @@ public static Number parseIntegral(String string) throws QlIllegalArgumentExcept
         }
     }
 
+    public static BytesRef parseIP(String string) {
+        var inetAddress = InetAddresses.forString(string);
+        return new BytesRef(InetAddressPoint.encode(inetAddress));
+    }
+
     public static String ordinal(int i) {
         return switch (i % 100) {
             case 11, 12, 13 -> i + "th";