Add support for structured output

[jovnc]

Summary

• Output messages as structured outputs, eg. JSON, to support git visualiser and electron app
• eg. use --json flag to output in JSON format
• Write an RFC design doc first

[seah-minlong]

Hi, I am interested to contribute to this. Would it be possible to share an example RFC doc to use as a reference before I get started?

[jovnc]

@seah-minlong I'm leaving this for the current development team, as this would require a larger refactor and RFC. In the meantime, I do recommend looking into some issues here: https://github.com/git-mastery/exercises/issues

[seah-minlong]

@jovnc sounds good, will do 👍