[AB-219] fixing cached message content not being updated

merging message updated listeners
adding clearing message cache to clear cache listener

abstracto-application/core/core-int/src/main/java/dev/sheldan/abstracto/core/service/MessageCache.java

@@ -11,4 +11,5 @@ public interface MessageCache {
     CompletableFuture<CachedMessage> getMessageFromCache(Message message);
     CompletableFuture<CachedMessage> putMessageInCache(CachedMessage message);
     CompletableFuture<CachedMessage> loadMessage(Long guildId, Long textChannelId, Long messageId);
+    void clearCache();
 }