Add support for specifying custom query string serializer and make header assertion case insensitive

The custom query string serializer could be used to specify how the query strings are serialized to a string before sending it in the request. For example:

import { stringify } from 'qs'
import { ApiRequest } from '@japa/api-client'

ApiRequest.setQsSerializer((value) => stringify(value))

test('send arrays in query string', ({ client }) => {
  await client
    .get('/')
    .qs('ids', ['1']) // send as Array
    .qs('usernames[]', 'virk') // send using array brackets in the key name
})

3.1.0 (2025-05-06)

Bug Fixes

• normalize header name in assertHeader & assertHeaderMissing (#15) (6fd8c08)

Features

• add support for specifying a custom query string serializer (1dc2334), closes #13

What's Changed

• fix: normalize header name in assertHeader & assertHeaderMissing by @Vahelnir in #15

New Contributors

• @Vahelnir made their first contribution in #15

Full Changelog: v3.0.4...v3.1.0