Refactored dto structure to reside in a single package

[BrunoRosendo]

closes #67

I decided to create the single DTO package in the global scope, since DTOs are used both in the controllers and in the services

Review checklist

• Properly documents API changes in docs/openapi.yml
• Contains enough appropriate tests
• Behavior is as expected
• Clean, well structured code

[codecov-commenter]

Codecov Report

Base: 92.10% // Head: 91.83% // Decreases project coverage by -0.26% ⚠️

Coverage data is based on head (fed15e5) compared to base (abba3d1).
Patch coverage: 73.33% of modified lines in pull request are covered.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop      #68      +/-   ##
=============================================
- Coverage      92.10%   91.83%   -0.27%     
- Complexity       162      167       +5     
=============================================
  Files             28       30       +2     
  Lines            342      343       +1     
  Branches          14       14              
=============================================
  Hits             315      315              
- Misses            16       17       +1     
  Partials          11       11              

Impacted Files	Coverage Δ
...ni/website/backend/controller/AccountController.kt	100.00% <ø> (ø)
...fe/ni/website/backend/controller/AuthController.kt	100.00% <ø> (ø)
...e/ni/website/backend/controller/EventController.kt	100.00% <ø> (ø)
...fe/ni/website/backend/controller/PostController.kt	100.00% <ø> (ø)
...ni/website/backend/controller/ProjectController.kt	100.00% <ø> (ø)
...up/fe/ni/website/backend/service/AccountService.kt	100.00% <ø> (ø)
...t/up/fe/ni/website/backend/service/EventService.kt	100.00% <ø> (ø)
...pt/up/fe/ni/website/backend/service/PostService.kt	100.00% <ø> (ø)
...up/fe/ni/website/backend/service/ProjectService.kt	100.00% <ø> (ø)
...t/up/fe/ni/website/backend/dto/entity/EntityDto.kt	71.42% <20.00%> (ø)
... and 7 more

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[bdmendes]

Looks good to me!