BiDataTable 支持字段名映射

[TechQuery]

Task description

1. BiDataTable 抽象类新增 keyMap 可选属性，形如 { keyInType: '表头名' }
2. this.normalize() 调用外包一层 this.mapFields()，以转换上述声明的键名，未声明的保留原样

Reward currency

TQT $

Reward amount

45

Reward payer

石垚 tech-query@idea2app.cn

Task source

https://idea2app.feishu.cn/record/PBrDrKlL6eBI5pcMaTPcn7pxnLh

[github-actions]

Reward data

- issue: "#23"
  payer: "@石垚 <tech-query@idea2app.cn>"
  payee: "@TechQuery"
  currency: TQT $
  reward: 45