Include empty fields in JSON responses #2132
Description
Is your feature request related to a problem? Please describe.
By default, Micronaut does not include null fields when serializing a Java object to JSON. When using any of our APIs, we would like to ensure that all fields are present in the JSON response, even if those fields are null.
Describe the solution you'd like
This change would affect all services. This can be done by changing the Jackson configuration.
Describe alternatives you've considered
Alternatively, each entity and response DTO could be annotated with @JsonInclude to achieve this behavior. However, it could result in inconsistently defining how objects are serialized. Since this is behavior we want for all services, it makes more sense to configure that at the application level.
Additional context
Depends on #2131