Pact Foundation

<https://github.com/pact-foundation/pact-php/pull/282|#282 Use Rust FFI #5: Provider>
Pull request opened by <https://github.com/tienvx|tienvx>
This is 5th pull request in a series of "small" pull requests I split from <https://github.com/pact-foundation/pact-php/pull/210|#210>

This pull request depend on <https://github.com/pact-foundation/pact-php/pull/281|#281>, please review it first.
<https://github.com/pact-foundation/pact-php|pact-foundation/pact-php>
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