feat: add user to slash command dimensions so that we know who's invoking commands

Author: surajkumar

application/src/main/java/org/togetherjava/tjbot/features/system/BotCore.java

@@ -387,6 +387,7 @@ public void onSlashCommandInteraction(SlashCommandInteractionEvent event) {
 
             Map<String, Object> dimensions = new HashMap<>();
             dimensions.put("name", name);
+            dimensions.put("user", event.getUser().getName());
 
             if (event.getSubcommandName() != null) {
                 dimensions.put("subCommandName", event.getSubcommandName());