Use Stream Encoder for JSON

[6543]

we could use https://github.com/json-iterator/go to speedup encoding/decoding.

also a stream interface can fix #14432

[zeripath]

this is a great idea.

[lunny]

Hm, If it supports copy data from a reader to responsewriter?

[zeripath]

https://godoc.org/github.com/json-iterator/go#NewStream

[lunny]

I also write a library https://gitea.com/lunny/dreamjson

[6543]

looking forward to #14841 ...

[lunny]

Since #14841 merged, maybe we could do something.

[zeripath]

https://pkg.go.dev/github.com/ohler55/ojg@v1.10.0/oj appears to have a direct writer interface that means