KAFKA-10849: Remove useless ApiKeys#parseResponse and ApiKeys#parseRequest

[dengziming]

More detailed description of your change
#7409 has removed the conversion to Struct when parsing resp, ApiVersionsResponse.parse will be used instead of API_VERSIONS.parseResponse, so the overwrite in ApiKeys.API_VERSIONS is useless.

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.

Committer Checklist (excluded from commit message)

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

[dengziming]

Hi, @chia7712 , PTAL.

[chia7712]

@dengziming Thanks for your patch. Could you also remove ApiKeys#parseResponse and ApiKeys#parseRequest? They are not used anymore.

[dengziming]

@chia7712 Thank you, I also created an issue and changed the title.

[chia7712]

@dengziming Thanks for your updating. requestSchema and responseSchema are not used by production code also. Could you remove them?

[dengziming]

@chia7712 I removed responseSchema which was used in ApiKeysTest.testResponseThrottleTime to inspect all response, I think it's similar to tests in ApiVersionsResponseTest, so I just also moved it.

[dajac]

@dengziming Do we maintain this fallback mechanism somewhere?

[chia7712]

@dajac Nice question. It is related to #7409 and the replacement is https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/common/requests/ApiVersionsResponse.java#L80

[chia7712]

@dengziming I just notice there is a PR (#9748) covering this one. Could you please close this PR and then be a reviewer for that PR?

[dengziming]

@chia7712 Oh, sorry for the repeated work, I just closed this pr.