Add json output

[KeisukeYamashita]

What

Like Spin, it's better to output the results with JSON format.

Why

Because JSON has more portability. Users can pass the marco results to jq to do some transformation, analytics, etc.

Why not use Spin

Spin outputs the result with the logs included.
And it does not support org-wide {application, pipeline} listing feature.

I would like to support this on marco.