Add an exception for extendedFieldName

[Mr14huashao]

Add a test case about boolean field for #699

[theigl]

@Mr14huashao: As I said in #759, we need a solution with minimal overhead. Ideally, the duplicate field check would be done only once when the serializer is first initialized. I think we should only log a warning so we do not break existing applications and force them to use extendedFieldNames.

[Mr14huashao]

@theigl Thank you for checking my code.
Based on the suggestion you provided, I modified some code, and the code is better.
I've benefited a lot from it.
Thank you very much.

[theigl]

@Mr14huashao: Sorry for the delay. I just reviewed your PR.

Please adjust your tests to use existing support from KryoTestCase and change your tests to look like others in the same file.

[theigl]

@Mr14huashao: I'm currently trying to stabilize Kryo 5.0.0 and will merge only bug fix PRs in the near future. Let's revisit this after Kryo 5.0.1 has been released.

[Mr14huashao]

@theigl Do I want to modify some content based on the current version?