添加获取所有用户的Server API

common/src/main/java/cn/wildfirechat/pojos/InputGetUserList.java

@@ -0,0 +1,6 @@
+package cn.wildfirechat.pojos;
+
+public class InputGetUserList {
+    public int count;
+    public int offset;
+}

common/src/main/java/cn/wildfirechat/pojos/OutputGetUserList.java

@@ -0,0 +1,7 @@
+package cn.wildfirechat.pojos;
+
+import java.util.List;
+
+public class OutputGetUserList {
+    public List<InputOutputUserInfo> userInfoList;
+}