Support "maybe" in the pact broker

[canny]

Swagger validation (and other spec-based validation) don't give the same confidence as a direct pact verification.
At the moment, these would be treated the same.
It would be great to be able to model different levels of deployment confidence in the broker.
One way to do this would be with a "maybe" status for can-i-deploy. Other ways might be several levels of deployment confidence, or different categories.

https://pact.canny.io/admin/board/feature-requests/p/support-maybe-in-the-pact-broker

[canny]

This issue has been linked to a Canny post: Support "maybe" in the pact broker 🎉