New candidate JEP: 453: Structured Concurrency (Preview)

[Mark Reinhold]

https://openjdk.org/jeps/453

  Summary: Simplify concurrent programming by introducing an API for
  structured concurrency. Structured concurrency treats groups of related
  tasks running in different threads as a single unit of work, thereby
  streamlining error handling and cancellation, improving reliability,
  and enhancing observability. This is a preview API.

- Mark