Define a database to manage bot users data

[clement-pages]

Task description

Users data are currently saved into multiple JSON files. It could be improved by implementing a true database.
This could be done using supabase, which includes free allowance.

Validation criteria

• : Create an account on supabase
• : Define a Database class to manage supabase database. This can be done via their REST API or by using their python SDK.
• : Update bot user implementation and move current data from json files to the database