Refactor/database

[vitormpp]

Closes #835

• Enhanced encapsulation for persistent and non-persistent session logic within database classes.
• Made the application database class abstract and refactored database classes accordingly.
• Refactored providers for improved structure and clarity.

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

[bdmendes]

@vitormpp is this ready?

[bartekpacia]

@vitormpp Could you rebase/merge with the master branch? I could then try to help you debug it.

[codecov]

Codecov Report

Attention: Patch coverage is 18.27957% with 76 lines in your changes missing coverage. Please review.

Project coverage is 17%. Comparing base (1809d46) to head (9cb9871).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1220   +/-   ##
=======================================
+ Coverage       17%     17%   +1%     
=======================================
  Files          229     229           
  Lines         6986    6992    +6     
=======================================
+ Hits          1167    1187   +20     
+ Misses        5819    5805   -14     

[thePeras]

nice work! ✅ 🛫

[DGoiana]

@vitormpp can you resolve this and merge it?

The review has been taken into account. No further action is required at this time.

[DGoiana]

The code looks very clean and well-written. Wonderful abstraction here. Nice job!