💫 feat: support for @defer

[carldunham]

Motivation and Context

A feature that may be helpful for complex and time-consuming operations that hit different subgraphs, but for which some data elements aren't needed as soon as others.

Checklist

• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.
• Documentation has been updated on https://github.com/wundergraph/cosmo-docs.
• I have read the Contributors Guide.

Depends on wundergraph/graphql-go-tools#1108