PoC: VMKeeper.QueryEvalJSON

[anarcher]

Description

Render is an interesting feature in gno. But IMHO, Query with json would be nice to programmatically interact.

package hello

type User struct {
        ID   int    `json:"id"`
        Name string `json:"name"`
}

func Hello() *User {
        return &User{ID: 1, Name: "hello"}
}

$ gnokey query "vm/qeval" --data "gno.land/r/test2/hello2
Hello()"
height: 0
data: {"id":1,"name":"hello"}

I'm not sure that this approach is suitable or not in gno. and it`s not yet an accurate, performant json encoder for now. it's just POC.
What do you think about this approach? :-)

How has this been tested?

Partially.

[moul]

Related with #464

[moul]

FYI, I'm exploring a different way to manage this here: #439

[anarcher]

FYI, I'm exploring a different way to manage this here: #439

Ok, I'm fine to close this PR. :->

[moul]

There is no choice made yet. Let's keep this PR open while the discussion is still ongoing.