[v2/pkg/astprinter] astprinter does not output which interfaces given transitive interface implements

[lorf]

Description

Package v2/astprinter missing feature: it does not print which interfaces given transitive interface implements

Sample source code

Given the following source code

package main

import (
    "fmt"

    "github.com/wundergraph/graphql-go-tools/v2/pkg/ast"
    "github.com/wundergraph/graphql-go-tools/v2/pkg/astparser"
    "github.com/wundergraph/graphql-go-tools/v2/pkg/astprinter"
)

func main() {
    d, _ := astparser.ParseGraphqlDocumentString(`
        interface I1 {
            id: ID
        }
        interface I2 implements I1 {
            id: ID
        }
    `)

    out, _ := astprinter.PrintStringIndent(&d, "  ")
    fmt.Println(out)

    // Demonstrate that document's internal structure is correct
    for _, n := range d.RootNodes {
        if n.Kind == ast.NodeKindInterfaceTypeDefinition {
            for _, iRef := range d.InterfaceTypeDefinitions[n.Ref].ImplementsInterfaces.Refs {
                fmt.Printf("# Interface %v implements %v\n", d.NodeNameBytes(n),
                    d.ResolveTypeNameBytes(iRef))
            }
        }
    }
}

Expected result

I expected to see the following result (interface I2 definition implements I1):

interface I1 {
    id: ID
}

interface I2 implements I1 {
    id: ID
}
# Interface I2 implements I1

Actual result

What i've got (interface I2 definition DOES NOT implements I1):

interface I1 {
    id: ID
}

interface I2 {
    id: ID
}
# Interface I2 implements I1