KAFKA-16681: Rewrite MiniKDC by Java

[FrankYang0529]

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Summary of testing strategy (including rationale) for the feature or bug fix. Unit and/or integration tests are expected for any behaviour change and system tests should be considered for larger changes.

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• [ ] Verify design and implementation
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[chia7712]

@FrankYang0529 could you please rebase code and then fix the import order?

[chia7712]

@FrankYang0529 could you please fix conflicts

[FrankYang0529]

@FrankYang0529 could you please fix conflicts

Hi @chia7712, I resolve conflicts. Could you take a look when you have time? Thank you.