[opt](auto bucket) add fe config autobucket_max_buckets (#33842)

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

@@ -2341,12 +2341,18 @@ public class Config extends ConfigBase {
     })
     public static long analyze_record_limit = 20000;
 
-    @ConfField(description = {
+    @ConfField(mutable = true, description = {
             "Auto Buckets中最小的buckets数目",
             "min buckets of auto bucket"
     })
     public static int autobucket_min_buckets = 1;
 
+    @ConfField(mutable = true, description = {
+        "Auto Buckets中最大的buckets数目",
+        "max buckets of auto bucket"
+    })
+    public static int autobucket_max_buckets = 128;
+
     @ConfField(description = {"Arrow Flight Server中所有用户token的缓存上限，超过后LRU淘汰，默认值为512, "
             + "并强制限制小于 qe_max_connection/2, 避免`Reach limit of connections`, "
             + "因为arrow flight sql是无状态的协议，连接通常不会主动断开，"