JIRA: https://jira.spring.io/browse/INT-4001
Since all other Spring Framework components use the Jackson's `ObjectMapper` configuration by default as:
```
this.objectMapper.configure(MapperFeature.DEFAULT_VIEW_INCLUSION, false);
this.objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
```
It would be better to be consistent in Spring Integration, too.
* Add mention options to the `Jackson2JsonObjectMapper` default's `ObjectMapper`
* Add on more constructor into the `Jackson2JsonMessageParser` to allow to inject customized `Jackson2JsonObjectMapper`
* Modify a couple tests to reflect the change
* Reformat code style in the `AbstractJsonInboundMessageMapperTests` for better readability
**The Migration Guide note follows up**
1dc4ebe4d1