Refactor module names to reflect component location in architecture

[nelsonkopliku]

Module names should reflect their location in the architecture.

For instance the application service Trento.SapSystems.HealthSummaryService should be Trento.Application.UseCases.SapSystems.HealthSummaryService.

It doesn't have to be prescriptive, yet clear and useful.
Let's have a discussion about this.

For instance the dto located in lib/trento/application/usecases/sap_systems/dto/health_summary_dto.ex

could be
Trento.Application.UseCases.SapSystems.Dto.HealthSummary or
Trento.Application.UseCases.SapSystems.Dto.HealthSummaryDto 👎

or simply
Trento.Application.UseCases.SapSystems.HealthSummaryDto

which is also acceptable.