ESQL: TO_IP can handle leading zeros (#126532)

Modifies TO_IP so it can handle leading `0`s in ipv4s. Here's how it
works now:
```
ROW ip = TO_IP("192.168.0.1") // OK!
ROW ip = TO_IP("192.168.010.1") // Fails
```

This adds
```
ROW ip = TO_IP("192.168.010.1", {"leading_zeros": "octal"})
ROW ip = TO_IP("192.168.010.1", {"leading_zeros": "decimal"})
```

We do this because there isn't a consensus on how to parse leading zeros
in ipv4s. The standard unix tools like `ping` and `ftp` interpret
leading zeros as octal. Java's built in ip parsing interprets them as
decimal. Because folks are using this for security rules we need to
support all the choices.

Closes #125460

Author: nik9000

docs/changelog/126532.yaml

@@ -0,0 +1,6 @@
+pr: 126532
+summary: TO_IP can handle leading zeros
+area: ES|QL
+type: bug
+issues:
+ - 125460

docs/reference/query-languages/esql/_snippets/functions/examples/to_ip.md

@@ -133,6 +133,7 @@ public class CsvTestsDataLoader {
     private static final TestDataset ADDRESSES = new TestDataset("addresses");
     private static final TestDataset BOOKS = new TestDataset("books").withSetting("books-settings.json");
     private static final TestDataset SEMANTIC_TEXT = new TestDataset("semantic_text").withInferenceEndpoint(true);
+    private static final TestDataset LOGS = new TestDataset("logs");
 
     public static final Map<String, TestDataset> CSV_DATASET_MAP = Map.ofEntries(
         Map.entry(EMPLOYEES.indexName, EMPLOYEES),
@@ -182,7 +183,8 @@ public class CsvTestsDataLoader {
         Map.entry(DISTANCES.indexName, DISTANCES),
         Map.entry(ADDRESSES.indexName, ADDRESSES),
         Map.entry(BOOKS.indexName, BOOKS),
-        Map.entry(SEMANTIC_TEXT.indexName, SEMANTIC_TEXT)
+        Map.entry(SEMANTIC_TEXT.indexName, SEMANTIC_TEXT),
+        Map.entry(LOGS.indexName, LOGS)
     );
 
     private static final EnrichConfig LANGUAGES_ENRICH = new EnrichConfig("languages_policy", "enrich-policy-languages.json");

docs/reference/query-languages/esql/_snippets/functions/functionNamedParams/to_ip.md

@@ -0,0 +1,5 @@
+@timestamp:date         ,system:keyword,message:keyword
+2023-10-23T13:55:01.543Z,          ping,Pinging 192.168.86.046
+2023-10-23T13:55:01.544Z,          cron,Running cats
+2023-10-23T13:55:01.545Z,          java,Doing java stuff for 192.168.86.038
+2023-10-23T13:55:01.546Z,          java,More java stuff