Migrate deprecated configuration option processing ExtendedConfigKey processing.

Aiven-commons project has an ExtendedConfigKey that handles deprecation notification.

This change is to move deprecation processing (mostly in S3) to use the ExtendedConfigKey in preparation to moving to aiven-commons.

The tasks involved here are to

1. Copy the aiven-commons / kafka-config / src/java packages to the commons / src directory of this project.
2. Modify the code that processed deprecated configuration options (mostly in S3) to use the ExtendedConfigKey for all deprecated options.
3. Modify the code to ensure that use of deprecated options is reported in the log.