refact mysql output (de)serialize with data type serde , avoid accoriding switch case Primitive type writed in mysqlWriter
1. Make sure all sub types which STRUCT supported work correctly; 2. remove unused variable `_need_validate_data`; 3. lazy init min or max decimal to support nested DecimalV2 column validate; Co-authored-by: cambyzju <zhuxiaoli01@baidu.com>
