Use Rust FFI #10: Remove pact broker

[tienvx]

This PR follow suggestion from @mefellows that:

• Don't embed cli (from Ruby Standalone) into Pact-PHP
• Recommend most users of Pact to pick your client language (e.g. PHP) and then download the CLI tools to do the CI/CD integration

One of the reason is: The Ruby Standalone has windows long file path and not working on a bunch of OS/Arch combinations. So bundling it into Pact PHP will mean Pact PHP won’t be installable on those same systems

@mefellows will give further explanation if needed.

I think this suggestion make sense because:

• This speed up the tests, because if we register more than 1 listener, they will publish pacts multiple times.
• Sometime we just want to run the tests, but don't want to publish pacts (e.g. local development?)
• Let imagine there are 3 test suites (Unit, Contract, Integration) running in this specific order. If Unit and Contracts tests are passed, the listener publish pacts, but then Integration tests failed. Then I think we published some pacts that we don't really want.

For Github Actions it's quite easy to add a step to publish pacts while still follow other recommendation (like include commit SHA in the version, use branch instead of tag):

    - name: Publish pacts
      uses: pactflow/actions/publish-pact-files@auto_detect_version_branch
      env:
        pactfiles: tests/Contract/pacts
        PACT_BROKER_BASE_URL: ${{ secrets.PACT_BROKER_BASE_URL }}
        PACT_BROKER_TOKEN: ${{ secrets.PACT_BROKER_TOKEN }}

This PR depend on #284. Please review it first.

[tienvx]

it could become a separate PHP package

@YOU54F thanks for the idea. I will take it into account when this PR is being reviewed.

[YOU54F]

merged in #323

e401847

[tienvx]

Close as there will be a PR from ffi to master