feat: 添加 As 注解解决列名冲突问题。

mybatis-flex-annotation/src/main/java/com/mybatisflex/annotation/As.java

@@ -0,0 +1,39 @@
+/*
+ *  Copyright (c) 2022-2023, Mybatis-Flex (fuhai999@gmail.com).
+ *  <p>
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *  <p>
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *  <p>
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package com.mybatisflex.annotation;
+
+import java.lang.annotation.*;
+
+/**
+ * 别名注解，用于解决列名重复。
+ *
+ * @author 王帅
+ * @since 2023-06-30
+ */
+@Inherited
+@Retention(RetentionPolicy.RUNTIME)
+@Target({ElementType.FIELD, ElementType.METHOD})
+public @interface As {
+
+    /**
+     * 列的别名。
+     *
+     * @return 别名
+     */
+    String value();
+
+}