Support pact-js V3 interface

[TimothyJones]

(this ticket copied from #31 so that the task stays open + visible)

Currently this project only supports the old DSL from 9.x and before.

It would be good to extend nestjs-pact to support the DSL introduced from pact-js@10 onwards (introduced for supporting V3 spec files). This would also support plugins and other features for free.

[YOU54F]

please don’t copy my text verbatim, there was a reason i closed the pr and linked issue.

there are 101 issues we could raise that haven’t been listed for work to be done, now in all honesty if noone is going to work on them, they don’t serve any value.