Make OffenseCollection and Configuration public

[alexevanczuk]

What are you trying to accomplish?

OffenseCollection should be public since it's part of the public API for OffensesFormatter and needs to be referenced in the sig when creating another implementation of the OffensesFormatter.

Configuration should be public since it's part of the public API for Validator.

What approach did you choose and why?

Making constants public by removing private_constant.

Type of Change

• Bugfix
• New feature
• Non-breaking change (a change that doesn't alter functionality - i.e., code refactor, configs, etc.)

Checklist

• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• It is safe to rollback this change.