JTA 1.2 support, in particular for the javax.transaction.Transactional annotation

Issue: SPR-9139
JSR-236 support, in particular adapting to JSR-236 Triggers and exposing additional metadata through ManagedTasks

This is built into ConcurrentTaskExecutor and ConcurrentTaskScheduler now, automatically detecting the JSR-236 ExecutorService variants and adapting to them.

Issue: SPR-8195