feat: 新增 CORS 跨域策略处理函数，提供不同架构下统一的跨域处理方案

sa-token-core/src/main/java/cn/dev33/satoken/fun/strategy/SaCorsHandleFunction.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2020-2099 sa-token.cc
+ *
+ * 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
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * 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 cn.dev33.satoken.fun.strategy;
+
+import cn.dev33.satoken.context.model.SaRequest;
+import cn.dev33.satoken.context.model.SaResponse;
+import cn.dev33.satoken.context.model.SaStorage;
+
+/**
+ * CORS 跨域策略处理函数
+ *
+ * @author click33
+ * @since 1.42.0
+ */
+@FunctionalInterface
+public interface SaCorsHandleFunction {
+
+    /**
+     * CORS 策略处理函数
+     *
+     * @param req 请求包装对象
+     * @param res 响应包装对象
+     * @param sto 数据读写对象
+     */
+    void execute(
+            SaRequest req,
+            SaResponse res,
+            SaStorage sto
+    );
+
+}

sa-token-core/src/main/java/cn/dev33/satoken/strategy/SaStrategy.java

@@ -184,6 +184,13 @@ public final class SaStrategy {
 		throw new NotImplException("未实现具体路由匹配策略").setCode(SaErrorCode.CODE_12401);
 	};
 
+	/**
+	 * CORS 策略处理函数
+	 */
+	public SaCorsHandleFunction corsHandle = (req, res, sto) -> {
+
+	};
+
 
 	// ----------------------- 重写策略 set连缀风格