Task/3 data validation

[OldMetalmind]

Close #3 #4

Description

This pull requests implements big changes on the script.

Changes:

• Creates two classes: MortalityScrapping, MortalityReport
  -- MortalityScrapping handles everything regarding data scrapping, processing and writing to file.
  -- MortalityReport verifies data structure and writes a small json report.
• Github Action mortality_data_extraction.yml now runs every hour and it will ran the scraping.py and the respective tests
• Github Action data_extraction_validation will also run the scraping.py script at the end of every other step

[piresn]

O refactoring com as 2 classes faz bastante sentido. Só detectei um problema com o logging (todos os dias têm missing values, mas eles são de esperar em várias colunas. Tb tenho uma sugestão para o scheduling do Actions. De resto parece-me bem!