add json cli flag for act compat

[ChristopherHX]

This is experimental

@SanjulaGanepola no idea if the output is close enough to act, like in act some log lines are invalid json.

[SanjulaGanepola]

This is great! I am actively working on the change in the extension to support the job and step level status. I will update you once this is complete so we can do some testing with both act and runner.server.