[Enhancement] speed up processing of json

[4cecoder]

use this algo for json instead of std json lib
https://github.com/json-iterator/go

[4cecoder]

https://github.com/mailru/easyjson

[4cecoder]

https://github.com/goccy/go-json

[4cecoder]

one of these should help speed up json processing

[4cecoder]

Done in PR #66: data/json.go now uses json-iterator/go's ConfigCompatibleWithStandardLibrary instead of encoding/json.

[4cecoder]

Closing — resolved by #66.