Federation plugin does not import autobind and generated models

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What happened?

When using the federation plugin with the @entityResolver(multi: true) directive, the entity's input struct is created in the generated models file.
If the generated models are located not in the same package as the federation package, we get an undeclared name error, as the generated federation file does not import the models.

What did you expect?

When generating the federation file, it should include the generated models import and the autobind imports if needed.

Minimal graphql.schema and models to reproduce

Schema:

type MultiHello @key(fields: "name") @entityResolver(multi: true) {
    name: String!
}

Generated input struct in models_gen.go:

type MultiHelloByNamesInput struct {
	Name string `json:"ID"`
}

versions

• go run github.com/99designs/gqlgen version v0.17.13
• go version 1.17.9

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