Add a debug mode to base worker and allow upper workers to use it

Refs https://gitlab.com/arkindex/requests/-/issues/489

Base worker should expose a CLI argument --debug that triggers changes on the logging configuration, enabling more output (from logger.debug calls)

The value should come from, by priority:

• CLI arg --debug: used by developers
• ARKINDEX_DEBUG environment variable set to true
• debug from worker configuration (bonus)