[V3] Add a Dynamic key matcher similar to eachKeyLike in pact-jvm

[francislobo]

Checklist

Before making a feature request, I have:

• Searched the issues to check that this feature hasn't been requested before - here and here
• Checked the documentation to see if it is possible to do what I want already
• Reached out to devs on Slack about this issue

Feature description

Need a matcher for dynamic object keys similar to eachKeyLike in Pact-JVM

Use case

The use case is similar to the one mentioned in : pact-foundation/pact-specification#47

We have a few APIs where the property key changes based on the context and we use eachKeyLike for the contracts generated from pact-JVM

we are planning to migrate to use Pact-JS and are unable to migrate due to the lack of eachKeyLike

[TimothyJones]

Thanks for the report! We'll make sure this is on the pre-release checklist.

[mefellows]

eachKeyLike has been added to the latest beta (v10.0.0-beta.34). Let me know how it goes!

I'll close for now, but please of course share any feedback here and we can re-open if the DSL isn't what we expected.