feat: parse array query by qs

[czy88840616]

Objectives

We want to parse array query parameters in Koa. By default, Koa uses querystring to parse parameters like 'a[]=1', resulting in an object:

{
    "a[0]": 1,
    "a[1]": 2,
}

However, we desire to obtain values in a format similar to koa-qs

{
    "a": [1, 2]
}