Release timeline for 2.24.0

[John Engebretson]

  Hi, my company is looking forward to the performance improvements
associated with 2.24.0 (specifically #2330).  Most of our applications rely
on MDC or CloseableThreadContext and the performance benefits will be
widespread.  The long-debated ScopedContext is not significant to us. Can
we set a target date for 2.24.0?  Perhaps by punting ScopedContext to a
later date?

  Thanks!

      John