Replace spotless with Checkstyle and OpenRewrite #6988
+195
−53
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Summary
This introduces Checkstyle and OpenRewrite to validate and fix that we don't have unused, duplicate or star imports. OpenRewrite is not run by default. In the future, we will add more rules to Checkstyle and and recipes to OpenRewrite to autofix those issues.
Issue
Related to Helsinki's OTP Summit discussions and #6913.
Unit tests
No
Documentation
Updated
Changelog
Not sure if needed