[ ] I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
[x] The correct base branch is being used, if not main
[x] I have added tests to validate that the change in functionality is working as expected
Description
Switches to async style Java.
The core of async is in HttpClient, and the ability to configure things like thread pools is in HttpClient.Builder.executor(Executor)
References
Review Checklist
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