[PR] [feature](fe) LIST partition table support modify default bucket num [doris]

[via GitHub]

htyoung opened a new pull request, #39688:
URL: https://github.com/apache/doris/pull/39688

   ## Proposed changes
   
   Issue Number: close #39684
   
   <!--Describe your changes.-->
   
   ```sql
   CREATE TABLE `test1` (
       `id1` VARCHAR(255) NULL COMMENT 'id1',
       `id2` VARCHAR(255) NULL COMMENT 'id2',
       `event_time` VARCHAR(255) NULL COMMENT '事件时间',
       `event_date` VARCHAR(255) NULL COMMENT '事件日期',
       `event_ts` VARCHAR(256) NULL COMMENT '事件发生时间戳(毫秒)',
       `dt` VARCHAR(255) NOT NULL COMMENT '日期分区',
       `hr` VARCHAR(255) NOT NULL COMMENT '小时分区'
     ) ENGINE = OLAP DUPLICATE KEY(`id1`) COMMENT 'xxx' PARTITION BY LIST(`dt`, 
`hr`) (
       PARTITION p2024082021 VALUES IN (("2024-08-20", "21"))
     ) DISTRIBUTED BY HASH(`dt`, `hr`) BUCKETS 2 PROPERTIES (
       "replication_allocation" = "tag.location.default: 1",
       "min_load_replica_num" = "-1",
       "is_being_synced" = "false",
       "storage_medium" = "hdd",
       "storage_format" = "V2",
       "inverted_index_storage_format" = "V1",
       "light_schema_change" = "true",
       "disable_auto_compaction" = "false",
       "enable_single_replica_compaction" = "false",
       "group_commit_interval_ms" = "10000",
       "group_commit_data_bytes" = "134217728"
     );
   ```
   
   1. 修改前表已有分区的bucket num为2
   
![image](https://github.com/user-attachments/assets/77efdd0c-f845-41a4-9a31-e454808ffe67)
   
   2. 修改List分区表bucket num（从2 -> 4）
   
![image](https://github.com/user-attachments/assets/53b19918-2879-4cb3-b2bd-84ba35a7fc59)
   
   3. 修改List分区后，添加的新分区bucket num为4
   
![image](https://github.com/user-attachments/assets/1f41f73f-d70f-433e-a7b6-8346b7dfcc4e)
   


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