[AF-19] Add service layer

[ricardopacheco]

Issue number: resolves #19

Summary 🔴

This Pr adds an additional layer called services, to deal with external services and already adds the first service, email. Additional add-ons are available in the changelog in version 0.5.0.

Proposed / Possible solution 🔴

We added a standardized directory structure to scale the code across services, and in addition, we used a performant email sending gem to build the email frontend and trigger for the email service. The choice had only performative reasons.

A change has also been made to I18n, allowing not just contracts, but all layers to be their own isolated structure. This will facilitate possible changes in the future.

The use of environment variables was also inclusive as we followed the 12factor standard.

How to test 👮‍♂️

Start the related services, and open the console with the command bin/console. After that:

user = OpenStruct.new(user: "My name", email: "[email protected]")

AuctionFunCore::Services::Mail::UserContext::RegistrationMailer.new(user).deliver

To simulate the successful sending of an email, change the values of the user variable, which must contain the name and email attributes.

Risks / Impacts 🔴

• None anticipated

Requirements for deployment 🔴

• A new exclusive issue must be created to change the SMTP communication structure to match the chosen external email provider.