feat(java): Add 'Expose' annotation to support "only de/serialize annotated fields"

[urlyy]

What does this PR do?

Add Expose annotation to support "only de/serialize annotated fields"

Related issues

#1735

Does this PR introduce any user-facing change?

• Does this PR introduce any public API change?
• Does this PR introduce any binary protocol compatibility change?

Benchmark

N/A

[urlyy]

@chaokunyang I have already modified the code style according to the output of mvn checkstyle:check, but it still did not pass the GitHub Actions check. Can you help me identify the reason?

[chaokunyang]

You need to format code by mvn spotless:apply

[chaokunyang]

The code looks good, but I have concerns about the annotation name. This is the hard one. We have many choices such as Expose/SerializeField/FuryField/Include/FuryInclude. I'm not sure which is better

[chaokunyang]

I think we can name it as Expose, and in future we can add more advanced annotation like:

@interface Include {
  String[] fieldsNames();
}

@interface Exclude {
  String[] fieldsNames();
}

@Include(fieldsNames={"f1"})
class Foo {
  inf f1;
  bool f2;
}

@Exclude(fieldsNames={"f2"})
class Foo {
  inf f1;
  bool f2;
}

@LiangliangSui do you have any suggestions?

[chaokunyang]

LGTM