Fixing the cookies field in the v2 request object.

[philcali]

Issue #, if available:

The V2 request object would not use the cookies field in the 2.0 schema. It would default to an empty array. See https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-develop-integrations-lambda.html for raw input details.

Description of changes:

This change first checks of the cookies field is set on the underlying request POJO and will use that instead.

By submitting this pull request

• I confirm that my contribution is made under the terms of the Apache 2.0 license.
• I confirm that I've made a best effort attempt to update all relevant documentation.

[deki]

Thanks for your contribution, @philcali

[deki]

@philcali I just noticed there are two test failures after this change. Can you take a look please?

cookie_getCookies_multipleCookies2: Cookie name " test_cookie_param" is a reserved token
cookie_getCookies_emptyCookies2: Index 1 out of bounds for length 1