Provide column.key in orderByCollection for remote sorting

[kkl4261]

• Request

Allow the user to access column field attribute in Query.orderByCollection[] directly, instead of requiring the user to pass the columns prop manually into the query method.

• Description

Currently, only column index is provided in the query.orderByCollection, which is insufficient in case a sortKey has to be passed to the API for remote sorting. Requiring the user to manually compute the column field string in query method is quite unintuitive.
In fact this has made the code migration from using orderBy props to orderByCollection props quite difficult.

• Expectation

Add orderByField:string in the interface OrderByCollection

[Domino987]

Sounds reasonable. Can you create a PR?

[kkl4261]

Sure. Will open one in a few days.