Set cookies in lambda resolver

### Is this related to a new or existing framework?

_No response_

### Is this related to a new or existing API?

GraphQL API

### Is this related to another service?

Lambda

### Describe the feature you'd like to request

I want to be able to set cookies in my lambda resolver. This would help me store secure, HTTP-only cookies.

### Describe the solution you'd like

I want to set cookies in the lambda function like
`
exports.handler = async (event, context, callback) => {

const response = {
headers : {
"Set-Cookie" : [`example-cookie=value`]
}
}
callback(null, response)

and the set cookie must be available as the response header of the Graphql HTTP call from the client.

### Describe alternatives you've considered

Tried to set the cookie client-side, but it is an insecure solution.

### Additional context

_No response_

### Is this something that you'd be interested in working on?

- [ ] 👋 I may be able to implement this feature request
- [ ] ⚠️ This feature might incur a breaking change

Start by tracing how the Lambda resolver response becomes the GraphQL HTTP response, focusing on how response headers are represented. Done means a resolver can return a cookie that appears in the GraphQL response headers, including secure and HTTP-only cookie attributes.

Written by the indexing model from the issue text.