add a basic event system to clean up scoresaber score receiving

src/main/java/cc/fascinated/bat/event/EventListener.java

@@ -0,0 +1,20 @@
+package cc.fascinated.bat.event;
+
+import cc.fascinated.bat.model.beatsaber.scoresaber.ScoreSaberLeaderboardToken;
+import cc.fascinated.bat.model.beatsaber.scoresaber.ScoreSaberPlayerScoreToken;
+import cc.fascinated.bat.model.beatsaber.scoresaber.ScoreSaberScoreToken;
+
+/**
+ * @author Fascinated (fascinated7)
+ */
+public interface EventListener {
+    /**
+     * Called when a ScoreSaber score is received
+     *
+     * @param score the score that was set
+     * @param leaderboard the leaderboard that the score was set on
+     * @param player the player that set the score
+     */
+    default void onScoresaberScoreReceived(ScoreSaberPlayerScoreToken score, ScoreSaberLeaderboardToken leaderboard,
+                                           ScoreSaberScoreToken.LeaderboardPlayerInfo player) {}
+}