Make DTOs Fluent.

[r-kujawa]

Describe the solution you'd like. ✈️

Extend Laravel's Fluent::class for the following DTOs:

1. Payavel\Orchestration\DataTransferObjects\Service::class
2. Payavel\Orchestration\DataTransferObjects\Provider::class
3. Payavel\Orchestration\DataTransferObjects\Account::class

What problem will this solve? 🔥

Improves the DX.

Which version(s) should this be pointed at?

Probably 3.0 since it would result in a breaking change, as we might need to remove the SimulatesAttributes trait in favor of the Fluent::class's magic methods. But maybe there is a possibility to duplicate these DTOs in 2.x and deprecate the existing ones.

[r-kujawa]

Let's deal with #73 before this one. To prevent double work.