Add task categorization groups for reporting.

[jamestalmage]

It would be good to be able to categorize tasks for reporters...

We've got run / build / test as types, but I'd love my reporter to categorize linting/formatting, unit test failures, integration test failures, flaky test failures separately... I don't think it should be up to moon to prescribe those categories... But some way for me to attach metadata that gets passed along...

What if there was a free-form metadata (or pick some other name) property available as top level in the workspace.yml, top level in the project moon.yml, and per task? The contract being that moon will not alter its behavior at all based on those, but they will all be included in the ciReport.yml / runReport.yml? This would free moon from being responsible from committing to a structured way of doing what I'm asking here, allow some experimentation in tools that might want to use that metadata (like reporters), and they you've always got the option to cherry-pick any good ideas that emerge as winners.

[milesj]

@jamestalmage I'm planning to add tags support to tasks. Would that suffice here?

[jamestalmage]

If the tags get embedded in the json run output, I don't see why not.