feat: 增强GetColumn接口，返回字段长度、枚举类型及值、索引信息 #2153
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- 在Column结构体中添加EnumType、EnumValues、IndexName、IndexType字段 - MySQL: 完善字段长度返回，支持枚举类型和值的提取，添加索引信息查询 - PostgreSQL: 完善字段长度返回，支持枚举类型和值的查询，添加索引信息查询 - MSSQL: 完善字段长度返回，添加索引信息查询 - Oracle: 完善字段长度返回，添加索引信息查询 - SQLite: 完善字段长度解析，添加索引信息查询 这些改进使得前端可以根据数据库实际结构生成对应的数据结构，包括： - 字段长度信息（dataTypeLong） - 枚举类型和枚举值（enumType, enumValues） - 索引名称和索引类型（indexName, indexType）
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功能说明
根据已有库结构返回数据库字段长度、字段类型（枚举）值、索引值，方便前端生成和当前结构一样的数据结构。
主要改进
返回数据结构
现在GetColumn接口返回的每个字段包含：
dataTypeLong: 字段长度信息enumType: 枚举类型（如：enum）enumValues: 枚举值（逗号分隔）indexName: 索引名称（多个用逗号分隔）indexType: 索引类型（PRIMARY/UNIQUE/INDEX，多个用逗号分隔）