Adding new library api

[DGoiana]

Closes #1317

Implementation of the new and fresh library occupation api.
As the api does not retrieve data about the capacity of each floor, it was manually inserted into a map.

Review checklist

• Terms and conditions reflect the current change
• Contains enough appropriate tests
• If aimed at production, writes a new summary in whatsnew/whatsnew-pt-PT
• Properly adds an entry in changelog.md with the change
• If PR includes UI updates/additions, its description has screenshots
• Behavior is as expected
• Clean, well-structured code

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 17 lines in your changes missing coverage. Please review.

Project coverage is 16%. Comparing base (fa3f3be) to head (452a6c4).
Report is 8 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1318   +/-   ##
=======================================
  Coverage       16%     16%           
=======================================
  Files          239     238    -1     
  Lines         7172    7172           
=======================================
  Hits          1078    1078           
  Misses        6094    6094