Eager load multiple nested relations using @with

[spawnia]

Resolves #1132, probably also #1873

• Added or updated tests
• Documented user facing changes
• Updated CHANGELOG.md

Changes

Breaking changes

[robsontenorio]

In this exactly old version 5.70.3, the nested relationship eager loading works .
But not on latest state version 6.x.

type Bar { 
      city: City  @method(name: "handleCity") @with(relation: "city.state")
}

[robsontenorio]

By the way , I have tested this PR and works fine, solve the problem. If you need some help to merge it let me know.

[spawnia]

By the way , I have tested this PR and works fine, solve the problem. If you need some help to merge it let me know.

The changes I made fix eager loading of multiple @with, but break other scenarios - see https://github.com/nuwave/lighthouse/actions/runs/9380728096/job/25828392738. Thus, it can not be merged as is, the final solution will have to look different.