feat(utils): 添加批量更新相关的一个数据转换工具函数 normBulkUpdate#532
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在批量接口使用 PUT 请求时，后端 response 上往往不会把所有更新的对象一
一罗列，而是以 `{ xxIds: Id[], ...updatedFields }` 的压缩形式呈现。这
样的数据是没办法直接更新到缓存层（RDB）的。
这里添加的 normBulkUpdate 函数可以用来将后端返回的这种压缩形式转换为缓
存层能接收的形式。如：
```
normBulkUpdate('taskIds', '_id')({
taskIds: ['123', '456'],
isArchived: true,
updated: '2018-08-21T05:43:10.000Z'
})
```
会得到
```
[
{_id: '123', isArchived: true, updated: '2018-08-21T05:43:10.000Z'},
{_id: '456', isArchived: true, updated: '2018-08-21T05:43:10.000Z'}
]
```
而在常见的 Observable response$ 上，则可以
```
response$.map(normBulkUpdate('taskIds', '_id'))
```
更多边界条件的行为定义，请见相应测试。
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在批量接口使用 PUT 请求时，后端 response 上往往不会把所有更新的对象一
一罗列，而是以
{ xxIds: Id[], ...updatedFields }的压缩形式呈现。这样的数据是没办法直接更新到缓存层（RDB）的。
这里添加的 normBulkUpdate 函数可以用来将后端返回的这种压缩形式转换为缓
存层能接收的形式。如：
会得到
而在常见的 Observable response$ 上，则可以
更多边界条件的行为定义，请见相应测试。
/cc @coldfannn @aicest