feat(pubsub): add unofficial broadcast settings topic

pubsub/src/main/java/com/github/twitch4j/pubsub/ITwitchPubSub.java

@@ -403,7 +403,6 @@ default PubSubSubscription listenForHypeTrainRewardEvents(OAuth2Credential crede
     }
 
     @Unofficial
-    @Deprecated
     default PubSubSubscription listenForBroadcastSettingUpdateEvents(OAuth2Credential credential, String channelId) {
         return listenOnTopic(PubSubType.LISTEN, credential, "broadcast-settings-update." + channelId);
     }

pubsub/src/main/java/com/github/twitch4j/pubsub/domain/BroadcastSettings.java

@@ -0,0 +1,25 @@
+package com.github.twitch4j.pubsub.domain;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import lombok.AccessLevel;
+import lombok.Data;
+import lombok.Setter;
+
+@Data
+@Setter(AccessLevel.PRIVATE)
+public class BroadcastSettings {
+    @JsonProperty("channel")
+    private String channelLogin;
+    private String channelId;
+
+    @JsonProperty("old_status")
+    private String oldTitle;
+    @JsonProperty("status")
+    private String title;
+
+    private String oldGame;
+    private String oldGameId; // "0" if unset
+
+    private String game;
+    private String gameId; // "0" if unset
+}

pubsub/src/main/java/com/github/twitch4j/pubsub/events/BroadcastSettingsUpdateEvent.java

@@ -0,0 +1,12 @@
+package com.github.twitch4j.pubsub.events;
+
+import com.github.twitch4j.common.events.TwitchEvent;
+import com.github.twitch4j.pubsub.domain.BroadcastSettings;
+import lombok.EqualsAndHashCode;
+import lombok.Value;
+
+@Value
+@EqualsAndHashCode(callSuper = false)
+public class BroadcastSettingsUpdateEvent extends TwitchEvent {
+    BroadcastSettings data;
+}

pubsub/src/main/java/com/github/twitch4j/pubsub/handlers/BroadcastSettingsHandler.java

@@ -0,0 +1,22 @@
+package com.github.twitch4j.pubsub.handlers;
+
+import com.github.twitch4j.common.events.TwitchEvent;
+import com.github.twitch4j.common.util.TypeConvert;
+import com.github.twitch4j.pubsub.domain.BroadcastSettings;
+import com.github.twitch4j.pubsub.events.BroadcastSettingsUpdateEvent;
+
+class BroadcastSettingsHandler implements TopicHandler {
+    @Override
+    public String topicName() {
+        return "broadcast-settings-update";
+    }
+
+    @Override
+    public TwitchEvent apply(Args args) {
+        if ("broadcast_settings_update".equals(args.getType())) {
+            BroadcastSettings data = TypeConvert.jsonToObject(args.getRawMessage(), BroadcastSettings.class);
+            return new BroadcastSettingsUpdateEvent(data);
+        }
+        return null;
+    }
+}

pubsub/src/main/java/com/github/twitch4j/pubsub/handlers/HandlerRegistry.java

@@ -33,6 +33,7 @@ public enum HandlerRegistry {
             new AdsManagerHandler(),
             new AutoModLevelHandler(),
             new BoostHandler(),
+            new BroadcastSettingsHandler(),
             new CharityHandler(),
             new ChatroomHandler(),
             new CheerbombHandler(),