Add support for Pact v3

[Former user]

This is becoming increasingly popular and has many benefits of using instead of v2, would love to see support for this added to the swagger-mock-validator

For a list of differences between Pact v2 and Pact v3 please see the Pact Specification: https://github.com/pact-foundation/pact-specification/tree/version-3

[Carl Zogheib]

^ created issue before logging in

[Ben Sayers]

Thanks @carlzogheib, I added this request to our backlog. Just to help you with your own planning please do not expect this to be implemented anytime soon as the team is very busy.

[Sebastian Tello]

This was implemented some time ago in 5bf15c3c and released in version 10.1.0. The only required change was to support the new query string format, the rest of the changes (messages, matchers, and generators) do not apply for this project.