Logging is now scoped to package name and does not overwrite any end-user configuration

[emaheuxPEREN]

Before this fix:

• Chepy was resetting any end-user logging configuration (at each Chepy() instantiation)
• Chepy was not using scoped logger preventing end-user using this library from precise configuration of its logging

Ref: https://docs.python.org/3.11/howto/logging.html#configuring-logging-for-a-library