Expose formatting options for pact verification

[TimothyJones]

Software versions

• OS: all
• Library version: 9.0.5
• Node Version: all

Description

Currently, it's not possible to use alternative formatting for provider verification. The underlying binary, pact-provider-verifier allows alternative output from the verification process with the format option:

--format=FORMATTER     # RSpec formatter. Defaults to custom Pact formatter. Other options are json and RspecJunitFormatter (which outputs xml).

This option isn't exposed in pact-node, and should be. Relevant changes would be here in pact-node and here in pact-js