Refactor to make use of the new user bean.

api/src/main/java/com/alttd/essentia/request/Request.java

@@ -0,0 +1,10 @@
+package com.alttd.essentia.request;
+
+public interface Request {
+
+    void accept();
+
+    void deny();
+
+    void cancel();
+}

api/src/main/java/com/alttd/essentia/user/User.java

@@ -1,5 +1,6 @@
 package com.alttd.essentia.user;
 
+import com.alttd.essentia.request.Request;
 import org.bukkit.Location;
 import org.jetbrains.annotations.ApiStatus;
 
@@ -41,4 +42,8 @@ public interface User {
 
     @ApiStatus.Internal
     void saving(boolean saving);
+
+    Request request();
+
+    void request(Request request);
 }