Add S3 based optimization cache support

We use kiwix_storagelib for implementing S3 based optimization cache in the scrapers. However, this gives rise to redundant code. We put a version of the file along with the optimizer version as the metadata always. So, this can be better implemented in scraperlib. For a start, we can have a caching module that can have 3 functions, (or maybe a class containing methods). The primary 3 things we need are -

• download_from_cache()
• upload_to_cache()
• check_credentials()

There can be several ways to have this, but it should at least fulfill the following -

• Compare optimizer_version
• Compare file_version

Optional things can be to check file upload date and discard if it's older than a specified amount of time. If we go for a class based approach, we can also explore possibilities to improve performance.

Commencez par examiner l’utilisation existante de kiwix_storagelib dans les scrapers et la manière dont les versions de optimizer et des fichiers sont stockées en tant que métadonnées. Définissez le point d’entrée du cache et vérifiez que les identifiants, les téléchargements, les téléversements et les deux comparaisons de versions sont couverts ; aucun fichier ni test précis n’est mentionné dans l’issue.