feat(gql-status-object): add legacy notification fields (#1676)

This update is for Neo4j private use only. It adds the following 3 legacy notification fields to `InternalGqlNotification`:
- `code`
- `title`
- `description`

Author: injectives

driver/src/main/java/org/neo4j/driver/internal/summary/InternalGqlNotification.java

@@ -17,6 +17,7 @@
 package org.neo4j.driver.internal.summary;
 
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import org.neo4j.driver.NotificationClassification;
 import org.neo4j.driver.NotificationSeverity;
@@ -31,6 +32,11 @@ public final class InternalGqlNotification extends InternalGqlStatusObject imple
     private final NotificationClassification classification;
     private final String rawClassification;
 
+    // private Neo4j use only
+    private final String code;
+    private final String title;
+    private final String description;
+
     public InternalGqlNotification(
             String gqlStatus,
             String statusDescription,
@@ -39,13 +45,19 @@ public InternalGqlNotification(
             NotificationSeverity severityLevel,
             String rawSeverityLevel,
             NotificationClassification classification,
-            String rawClassification) {
+            String rawClassification,
+            String code,
+            String title,
+            String description) {
         super(gqlStatus, statusDescription, diagnosticRecord);
         this.position = position;
         this.severityLevel = severityLevel;
         this.rawSeverityLevel = rawSeverityLevel;
         this.classification = classification;
         this.rawClassification = rawClassification;
+        this.code = code;
+        this.title = title;
+        this.description = description;
     }
 
     @Override
@@ -73,11 +85,47 @@ public Optional<String> rawClassification() {
         return Optional.ofNullable(rawClassification);
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        var that = (InternalGqlNotification) o;
+        return Objects.equals(gqlStatus, that.gqlStatus)
+                && Objects.equals(statusDescription, that.statusDescription)
+                && Objects.equals(diagnosticRecord, that.diagnosticRecord)
+                && Objects.equals(code, that.code)
+                && Objects.equals(title, that.title)
+                && Objects.equals(description, that.description);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(gqlStatus, statusDescription, diagnosticRecord, code, title, description);
+    }
+
     @Override
     public String toString() {
         return "InternalGqlNotification{" + "gqlStatus='"
                 + gqlStatus + '\'' + ", statusDescription='"
                 + statusDescription + '\'' + ", diagnosticRecord="
-                + diagnosticRecord + '}';
+                + diagnosticRecord + '\'' + ", code='"
+                + code + '\'' + ", title='"
+                + title + '\'' + ", description='"
+                + description + '}';
+    }
+
+    // private Neo4j use only
+    public String code() {
+        return code;
+    }
+
+    // private Neo4j use only
+    public String title() {
+        return title;
+    }
+
+    // private Neo4j use only
+    public String description() {
+        return description;
     }
 }

driver/src/main/java/org/neo4j/driver/internal/util/MetadataExtractor.java

@@ -281,7 +281,10 @@ private static Stream<GqlStatusObjectAndNotification> generateGqlStatusObjectsAn
                         severityLevel,
                         rawSeverityLevel,
                         (NotificationClassification) category,
-                        rawCategory);
+                        rawCategory,
+                        code,
+                        title,
+                        description);
                 var notification = new InternalNotification(
                         code, title, description, severityLevel, rawSeverityLevel, category, rawCategory, position);
                 return new GqlStatusObjectAndNotification(gqlNotification, notification);
@@ -378,7 +381,10 @@ private static GqlStatusObjectAndNotification extractGqlStatusObjectAndGenerateN
                     severity,
                     rawSeverity,
                     classification,
-                    rawClassification);
+                    rawClassification,
+                    neo4jCode,
+                    title,
+                    notificationDescription);
             var notification = new InternalNotification(
                     neo4jCode,
                     title,