chore[API]: create session factory to avoid memory leaks

[djsilva99]

Description

This Pull Request creates a session factory to avoid memory leaks.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 82.21154% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.69%. Comparing base (ab93fb8) to head (4d0e7e7).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
apps/api/src/main.py	36.84%	12 Missing ⚠️
.../api/src/adapters/repositories/feeds_repository.py	82.14%	9 Missing and 1 partial ⚠️
...pi/src/adapters/repositories/sources_repository.py	77.14%	6 Missing and 2 partials ⚠️
apps/api/src/adapters/entrypoints/v1/routes.py	86.48%	5 Missing ⚠️
apps/api/src/domain/handlers/job_processors.py	83.33%	2 Missing ⚠️

❌ Your project status has failed because the head coverage (80.69%) is below the target coverage (85.00%). You can increase the head coverage or adjust the target coverage.

@@             Coverage Diff             @@
##           develop      #71      +/-   ##
===========================================
- Coverage    81.19%   80.69%   -0.50%     
===========================================
  Files           45       43       -2     
  Lines         1441     1466      +25     
  Branches        96       93       -3     
===========================================
+ Hits          1170     1183      +13     
- Misses         236      250      +14     
+ Partials        35       33       -2     

Files with missing lines	Coverage Δ
...pi/src/adapters/repositories/filters_repository.py	100.00% <100.00%> (ø)
...pi/src/adapters/repositories/pickers_repository.py	100.00% <100.00%> (ø)
apps/api/src/configs/database.py	60.00% <100.00%> (ø)
apps/api/src/domain/services/job_service.py	80.45% <ø> (ø)
apps/api/src/domain/handlers/job_processors.py	83.33% <83.33%> (-16.67%)	⬇️
apps/api/src/adapters/entrypoints/v1/routes.py	74.78% <86.48%> (+1.23%)	⬆️
...pi/src/adapters/repositories/sources_repository.py	83.33% <77.14%> (+0.35%)	⬆️
.../api/src/adapters/repositories/feeds_repository.py	84.69% <82.14%> (+3.37%)	⬆️
apps/api/src/main.py	58.82% <36.84%> (-7.85%)	⬇️

... and 1 file with indirect coverage changes

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