[Java/Microprofile] Add support for Jackson serialization & async

[pravussum]

Add support for Jackson serialization & async interfaces using Mutiny in Java Microprofile library

This PR

• adds support for a new library option "microprofileMutiny" to generate async signatures in the API interfaces using SmallRye Mutiny which is the reactive library used by Quarkus - this will wrap the return types in Uni<>
• adds support for the Jackson JSON serialization in the Microprofile library - currently only JSONB is supported

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• Run the following to build the project and update samples:

  ./mvnw clean package 
  ./bin/generate-samples.sh
  ./bin/utils/export_docs_generators.sh
  

  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/java*.
  For Windows users, please run the script in Git BASH.
• File the PR against the correct branch: master (6.3.0) (minor release - breaking changes with fallbacks), 7.0.x (breaking changes without fallbacks)
• If your PR is targeting a particular programming language, @mention the technical committee members, so they are more likely to review the pull request.

/cc @bbdouglas @sreeshas @jfiala @lukoyanov @cbornet @jeff9finger @karismann @Zomzog @lwlee2608

[wing328]

@pravussum thanks for the PR. Can you please resolve the merge conflicts when merging the latest master into this PR?

[melloware]

@pravussum does this also handle Multipart correctly for Jackson? See: #10618

[pravussum]

@pravussum does this also handle Multipart correctly for Jackson? See: #10618

There has been no work regarding Multipart in the context of this PR 🤷

[pravussum]

@wing328 I adressed your comments and rebased on the current master.

[jekkel]

@wing328 Hey there - any reason this for this not being merged?

[wing328]

@jekkel have you tested the change locally?

I wasn't able to find time to run some tests and would appreciate if the community can help test it.

[jekkel]

@jekkel have you tested the change locally?

I wasn't able to find time to run some tests and would appreciate if the community can help test it.

We're running the branch version for quite some time now without any issues.

[wing328]

@jekkel that's good 👍

[wing328]

FYI. Merged #14614 to fix the code format

[jekkel]

Thanks! I wonder whether this could be automated.