[fix](cache) add sql cache conf cache_result_max_data_size (#22645)

Only the maximum number of rows in sql cache cache_result_max_row_count is not enough. If a row of data is too large, FE may OOM.

fe/fe-common/src/main/java/org/apache/doris/common/Config.java

@@ -1172,9 +1172,17 @@ public class Config extends ConfigBase {
     /**
      * Set the maximum number of rows that can be cached
      */
-    @ConfField(mutable = true, masterOnly = false)
+    @ConfField(mutable = true, masterOnly = false, description = {"SQL/Partition Cache可以缓存的最大行数。",
+        "Maximum number of rows that can be cached in SQL/Partition Cache, is 3000 by default."})
     public static int cache_result_max_row_count = 3000;
 
+    /**
+     * Set the maximum data size that can be cached
+     */
+    @ConfField(mutable = true, masterOnly = false, description = {"SQL/Partition Cache可以缓存的最大数据大小。",
+        "Maximum data size of rows that can be cached in SQL/Partition Cache, is 3000 by default."})
+    public static int cache_result_max_data_size = 31457280; // 30M
+
     /**
      * Used to limit element num of InPredicate in delete statement.
      */