KAFKA-15203 Use Classgraph since org.reflections is no longer under maintainence

[PARADOXST]

This is a continuity of #9048 that was paused ~4yrs ago.

https://github.com/ronmamo/reflections is no longer under maintenance and we should switch to
https://github.com/classgraph/classgraph that is more actively maintained and developped.

Committer Checklist (excluded from commit message)

• Verify design and implementation
• Verify test coverage and CI build status
• Verify documentation (including upgrade notes)

[gharris1727]

Relevant ticket: https://issues.apache.org/jira/browse/KAFKA-15203

[PARADOXST]

Special thanks to @cushon for helping me fix the problems with the switch!

[PARADOXST]

CI results: https://ci-builds.apache.org/job/Kafka/job/kafka-pr/job/PR-16604/7/testReport/org.apache.kafka.connect.runtime/

Test failures in other modules seems irrelevant.

[gharris1727]

Thanks @PARADOXST for the PR!

I was under the impression that we were going to be stuck with reflections for a long time, so this is nice to see.

[gharris1727]

I verified that this can discover all of the plugins that the reflections library could find, so this can be a drop-in replacement.

I did notice that it appears much slower than reflections, by about 3x in my environment with 250 plugins. While this isn't a dealbreaker (service_load is already recommended for performance reasons) perhaps there are still some easy wins for optimization. @PARADOXST it's up to you if you're interested in doing an optimization pass, or we could just leave it as-is.

[PARADOXST]

Regarding #16604 (comment): I have replaced enableAllInfo() with enableClassInfo() which should be of some improvements. I am happy to look at further perf improvement as a follow-up.

[PARADOXST]

@gharris1727 Hi Greg, can you take another look?

[gharris1727]

LGTM, thanks @PARADOXST !

I'm still seeing a performance degradation with this swap-out, but as I mentioned earlier I don't think it's a blocker.

[gharris1727]

Test failures appear unrelated.