Add TestNG -> AssertJ rules

[ssheikin]

What's changed?

Add TestNG -> AssertJ rules (applying minimal changes to JUnit -> AssertJ)

What's your motivation?

https://github.com/trinodb/trino/pull/22305

Anything in particular you'd like reviewers to focus on?

Anyone you would like to review specifically?

Have you considered any alternatives or workarounds?

I didn't find any better alternative.

Any additional context

This solution was good enough, maybe it will be helpful for someone. If someone willing to polish it to production-ready state - please be welcomed to take over this PR.

Checklist

• [ ] I've added unit tests to cover both positive and negative cases
• [ ] I've read and applied the recipe conventions and best practices
• [ ] I've used the IntelliJ IDEA auto-formatter on affected files