feat(adapter-nextjs): add runtimeOptions.cookies to createServerRunner

[HuiSF]

Description of changes

Add runtimeOptions to the createServerRunner function. e.g.:

createServerRunner({
  config,
  runtimeOptions: {
    cookies: {
      domain: '.example.com',
      sameSite: 'strict',
    }
  }
})

Issue #, if available

Description of how you validated changes

• unit tests
• manual testing with a sample app

Checklist

• PR description included
• yarn test passes
• Unit Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

Checklist for repo maintainers

• Verify E2E tests for existing workflows are working as expected or add E2E tests for newly added workflows
• New source file paths included in this PR have been added to CODEOWNERS, if appropriate

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[jjarvisp]

What is the purpose of spreading here first? Wouldn't the spread operation below avoid any issues with accidental top level referential assignment?