Add @ConditionalOnMissingBean JsonMapper bean declare

[kihwankim]

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previously I was using spring boot: 2.6 spring cloud: 2021.0.5 and sprig-cloud-stream-binder-kafka, but we need to upgrade spring boot version from 2.6 to 3.3.3 and we got a trouble from a problem consumer broken caused by type casting error.
The error occurred in the JsonMassageConverter due to ObjectMapper read error. this error caused by using web-only ObjectMapper which is declared primary and not using ObjectMapper for Consumer.

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What about adding @ConditionalOnMissingBean(JsonMapper.class) this annotation on JsonMapperConfiguration.jsonMapper method which is for creating a bean?
then I think the user can declare the JsonMapper bean as they want

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