packets, fancydialogs: Refactor custom action handling to use a map for additional data

plugins/fancydialogs/fd-api/src/main/java/com/fancyinnovations/fancydialogs/api/ConfirmationDialog.java

@@ -35,12 +35,14 @@ public class ConfirmationDialog {
                         new DialogButton(
                                 this.confirmText,
                                 this.confirmText,
-                                "confirm"
+                                "confirm",
+                                ""
                         ),
                         new DialogButton(
                                 this.cancelText,
                                 this.cancelText,
-                                "cancel"
+                                "cancel",
+                                ""
                         )
                 )
         );

plugins/fancydialogs/fd-api/src/main/java/com/fancyinnovations/fancydialogs/api/data/DialogButton.java

@@ -3,6 +3,7 @@ package com.fancyinnovations.fancydialogs.api.data;
 public record DialogButton(
         String label,
         String tooltip,
-        String action
+        String action,
+        String actionData
 ) {
 }