Add custom templates option

[FelipeGuzmanSierra]

Description

In this PR, a format_configuration was added to process custom templates based on the specific use case. The template should be included in the options map when initializing the use case (a required parameter). For example:

 options = {
    format_options: {
      template: "Happy birthday individual_name, today birth_date is your day!"
    }
  }

In the template, the attributes of the respective use case domain can be set to be replaced by the corresponding data after execution.

Closes #25

[L-Zuluaga]

Looks good!

Pretty interesting approach you used here, nice work! 🚀