Support read data from mysql when upload data

[FancyXun]

Follow this issue: FederatedAI/FATE#5669

Support uploading data from mysql:

Change the 'file' in upload_guest_mysql.json like bellow:

{
"file":"mysql://root:[email protected]:13312/fl/BREAST_HETERO_GUEST",
"head": true,
"partitions": 16,
"extend_sid": true,
"meta": {
"delimiter": ",",
"label_name": "y",
"match_id_name": "id"
},
"namespace": "experiment",
"name": "breast_hetero_guest_mysql"
}

Upload data
flow data upload -c upload_guest_mysql.json

The three formats of the file variable in this JSON are as follows:

mysql://user:password@host_ip:host_port/db/table
file:///path/to/local_file.csv
/path/to/local_file.csv

[FancyXun]

@sagewe
@dylan-fan

[sagewe]

首先很感谢你的贡献，社区对DCO有强制要求，请依照 Details 进行修复

有空看看 @zhihuiwan

[FancyXun]

首先很感谢你的贡献，社区对DCO有强制要求，请依照 Details 进行修复

有空看看 @zhihuiwan

Done!

[FancyXun]

补充一下：这样做的好处就是，能兼容现有的upload.json，只需要根据里面file的前缀判断是用读取mysql或者本地文件，json不需要新增内容。 @sagewe