GH-2611: Remove MimeTypeJsonDeserializer

[Wzy19930507]

Closes #2611

[artembilan]

@Wzy19930507 ,

Thank you for contribution as always!

Please, take a look what I did with commit message: 265e55f.

Technically you can do exactly the same when you open PR in your commit message.
It becomes a PR description and then when we merge, there is no need in extra modifications from our side.
The Fixes: # pattern would trigger automatic issue closing and so on for other actions if we need to back-port it or so.

[Wzy19930507]

No thanks, Spring kafka is a great framework that let me easy and security to work with kafka and spring. I‘m happy to contirbution ​on it.

Thanks for your guidance, I have learned and do it next PR.