Add support for retrieving all pacts for a given provider

Hi Neil! Rather than specifying one or more pact URLs, the provider name, and a list of consumer version tags can be specified, and the pact-provider-verifier will determine the right pacts to verify. This feature will be required for an upcoming feature release which will allow “pending pacts” to be verified without breaking the build. The --provider-version-tag will also be required for that feature. Here are the relevant bits of the CLI documentation.

Give me a yell if you need some clarification.

Usage:
  pact-provider-verifier PACT_URL ... -h, --provider-base-url=PROVIDER_BASE_URL

Options:
      [--provider=PROVIDER]
      [--consumer-version-tag=TAG]                                           # Retrieve the latest pacts with   this consumer version tag. Used in conjunction with --provider. May be specified multiple times.
      [--provider-version-tag=TAG]                                           # Tag to apply to the provider   application version. May be specified multiple times.

See:

https://github.com/pact-foundation/pact-provider-verifier#usage

[bethesque]

Time to make an omelette!

[bethesque]

Thanks Neil 🙏