introduce rankinfo command

Author: burdo

src/main/java/org/comroid/api/net/luckperms/model/group/GroupData.java

@@ -4,6 +4,12 @@
 import org.comroid.api.net.luckperms.model.node.Node;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.Objects;
+
 public record GroupData(
         String name, @Nullable String displayName, int weight, Node[] nodes, @Nullable Metadata metadata
-) {}
+) {
+    public String bestName() {
+        return Objects.requireNonNullElse(displayName, name);
+    }
+}