table enhancements

[jahnli]

This function solves the problem (这个功能解决的问题)

Using complex

Expected API (期望的 API)

1、Table drag stretch column width
2、Editable row
3、Expandable arrow hovers for cursor:pointer ，Animation transitions during expansion

[07akioni]

1. Not planned
2. You can use render function, we won't provide builtin support for editable table. There will be a demo later.
3. cursor: pointer is a good idea. Table won't provide expansion animation due to complexity of virtual scroll, it's hard to maintain.

[07akioni]

Expandable icon's cursor is fixed.