Add a method to get the twitch username in TwitchChatInput/Output

Author: hlxid

src/main/java/org/codeoverflow/chatoverflow/api/io/input/chat/TwitchChatInput.java

@@ -40,4 +40,11 @@ default void registerChatMessageReceiveEventHandler(Consumer<TwitchChatMessageRe
     default void registerPrivateChatMessageReceiveEventHandler(Consumer<TwitchPrivateChatMessageReceiveEvent> eventHandler) {
         registerEventHandler(eventHandler, TwitchPrivateChatMessageReceiveEvent.class);
     }
+
+    /**
+     * Returns the username of provided twitch account
+     *
+     * @return the twitch username of the bot
+     */
+    String getUsername();
 }

src/main/java/org/codeoverflow/chatoverflow/api/io/output/chat/TwitchChatOutput.java

@@ -17,4 +17,11 @@ public interface TwitchChatOutput extends ChatOutput {
      * @param channel name of the channel
      */
     void setChannel(String channel);
+
+    /**
+     * Returns the username of provided twitch account
+     *
+     * @return the twitch username of the bot
+     */
+    String getUsername();
 }