New candidate JEP: 428: Structured Concurrency (Incubator)

[mark.reinhold at oracle.com]

https://openjdk.java.net/jeps/428

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

- Mark