Client Query method is broken

[jmbass]

https://github.com/clems4ever/go-graphkb/blob/248e436b3630c94b59eca34f683b82d76e178ebb/internal/client/query.go#L40

CriteoKB explorer now returns the sources as part of an Item object in the response. sources is an array, which results in an unmarshalling error when trying to map the response to a QueryResponse object:

https://github.com/clems4ever/go-graphkb/blob/248e436b3630c94b59eca34f683b82d76e178ebb/internal/client/types.go#L40

I believe that we must either make the Items member of the response an [][]interface{} or make the Items a map[string]interface{} and then implement the adequate changes to the affected methods.

@ShimmerGlass