wundergraph: JSON scalar types not supported

Bug description

I have an upstream graphql server that uses JSON scalar types.

When the value returned for this scalar is a JSON object, wundergraph complains with the following error:

2022-12-14T13:53:48+11:00 ERROR apihandler/apihandler.go:801 ResolveGraphQLResponse {"component": "@wundergraph/node", "reqId": "44a4ae5f-ef82-a2e9-3731-7a0284accd0b", "error": "invalid value type 'object' for path /data/bar, expecting string, got: {\"type\":\"string\"}. You can fix this by configuring this field as Int/Float Scalar"}
github.com/wundergraph/wundergraph/pkg/apihandler.(*GraphQLHandler).ServeHTTP
        /home/runner/work/wundergraph/wundergraph/pkg/apihandler/apihandler.go:801
github.com/wundergraph/wundergraph/pkg/authentication.NewCSRFMw.func1.1
        /home/runner/work/wundergraph/wundergraph/pkg/authentication/authentication.go:864
net/http.HandlerFunc.ServeHTTP
        /opt/hostedtoolcache/go/1.18.8/x64/src/net/http/server.go:2084
github.com/wundergraph/wundergraph/pkg/authentication.NewLoadUserMw.func1.1
        /home/runner/work/wundergraph/wundergraph/pkg/authentication/authentication.go:655
net/http.HandlerFunc.ServeHTTP
        /opt/hostedtoolcache/go/1.18.8/x64/src/net/http/server.go:2084
github.com/rs/cors.(*Cors).Handler.func1
        /home/runner/go/pkg/mod/github.com/rs/cors@v1.7.0/cors.go:219
net/http.HandlerFunc.ServeHTTP
        /opt/hostedtoolcache/go/1.18.8/x64/src/net/http/server.go:2084
github.com/wundergraph/wundergraph/pkg/apihandler.(*Builder).BuildAndMountApiHandler.func4.1
        /home/runner/work/wundergraph/wundergraph/pkg/apihandler/apihandler.go:233
net/http.HandlerFunc.ServeHTTP
        /opt/hostedtoolcache/go/1.18.8/x64/src/net/http/server.go:2084
github.com/wundergraph/wundergraph/pkg/apihandler.logRequestMiddleware.func1.1
        /home/runner/work/wundergraph/wundergraph/pkg/apihandler/apihandler.go:353
net/http.HandlerFunc.ServeHTTP
        /opt/hostedtoolcache/go/1.18.8/x64/src/net/http/server.go:2084
github.com/gorilla/mux.(*Router).ServeHTTP
        /home/runner/go/pkg/mod/github.com/gorilla/mux@v1.8.0/mux.go:210
net/http.serverHandler.ServeHTTP
        /opt/hostedtoolcache/go/1.18.8/x64/src/net/http/server.go:2916
net/http.(*conn).serve
        /opt/hostedtoolcache/go/1.18.8/x64/src/net/http/server.go:1966

How to reproduce

I have been able to create a self-contained wundergraph project to reproduce the error, using the in-built graphql server. It is attached: wgtest.zip

To reproduce:

• install dependencies with yarn
• run with yarn start

Then visit the following URL: http://localhost:9991/operations/Hello

Expected behavior

The response from the server should be successfully returned to the caller.

For the attached project, that is: { "data": {"bar": {"type": "string"}} }

WunderGraph information

Included in the attached project

Environment & setup

• OS: Mint w/kernel 5.4.0-135-generic
• Go version: go version go1.13.8 linux/amd64
• Node.js version: v18.12.1

WunderCtl Version

119.1