Remove `ObjectMapper.setSerializationInclusion()` from 3.0 (deprecate in 2.20)

[cowtowncoder]

(note: this is retroactive issue -- actual removal done before 3.0.0-rc1 release)
(note: inspired by #5269)

With 3.0, ObjectMapper becomes immutable: this is achieved by removing all setXxx() methods (and other mutators). This includes setSerializationInclusion().

The replacement for:

ObjectMapper mapper = new ObjectMapper();
mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

is

ObjectMapper mapper = JsonMapper.builder()
    .changeDefaultPropertyInclusion(incl -> incl.withValueInclusion(JsonInclude.Include.NON_NULL))
    .build();

OR for also content (of arrays, Collections, Maps);

ObjectMapper mapper = JsonMapper.builder()
    .changeDefaultPropertyInclusion(incl -> incl.withValueInclusion(JsonInclude.Include.NON_NULL)
       .withContentInclusion(JsonInclude.Include.NON_NULL)
    )
    .build();

---

[TaylorSMarks]

@cowtowncoder - Small correction - I copy pasted your replacement code in and it didn't compile because it's missing a closing parenthesis. Fixed code:

ObjectMapper mapper = JsonMapper.builder()
    .changeDefaultPropertyInclusion(incl -> incl.withValueInclusion(JsonInclude.Include.NON_NULL))  // Lines ends with two closing parenthesis
    .build();

If we were on StackOverflow I'd just edit your post myself.

[cowtowncoder]

Thank you @TaylorSMarks , fixed above.

[cowtowncoder]

NOTE: "valueInclusion" is not always sufficient, may also need "contentInclusion". Edited the code example above.