[Optimize] Framework-API, Event 调整 EventUtils, Author 类以阻止被继承(和实例化);

[Optimize] Author 添加 final 关键字以阻止被继承;
[Optimize] EventUtils 添加 final 关键字和私有无参构造器以阻止被继承和实例化;

ContentGrabbingJi-framework-api/src/main/java/net/lamgc/cgj/bot/framework/Author.java

@@ -24,7 +24,7 @@ import java.util.Objects;
  * <p>我觉得改成维护者会更好一些?
  * @author LamGC
  */
-public class Author {
+public final class Author {
 
     private final String name;
     private final String url;