[app-wiring-refactor]: Apply review comments:

- Add reference to original library in `FluentBuilder`.
- Change `I<Name>` notation to `<Name>Impl` notation.
- Move error config to test resources
- Add comment with config instruction
- Add config to the documentation

Mage.Server/src/main/java/mage/server/managers/UserManager.java

@@ -0,0 +1,41 @@
+package mage.server.managers;
+
+import mage.server.AuthorizedUser;
+import mage.server.DisconnectReason;
+import mage.server.User;
+import mage.view.UserView;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+public interface UserManager {
+    Optional<User> createUser(String userName, String host, AuthorizedUser authorizedUser);
+
+    Optional<User> getUser(UUID userId);
+
+    Optional<User> getUserByName(String userName);
+
+    Collection<User> getUsers();
+
+    boolean connectToSession(String sessionId, UUID userId);
+
+    void disconnect(UUID userId, DisconnectReason reason);
+
+    boolean isAdmin(UUID userId);
+
+    void removeUserFromAllTablesAndChat(UUID userId, DisconnectReason reason);
+
+    void informUserOpponents(UUID userId, String message);
+
+    boolean extendUserSession(UUID userId, String pingInfo);
+
+    List<UserView> getUserInfoList();
+
+    void handleException(Exception ex);
+
+    String getUserHistory(String userName);
+
+    void updateUserHistory();
+}