Experimental Loomania blocking pool

[dmlloyd]

This implements a global switch which turns on Loomania for the normal blocking thread pool executor. Possibly useful for playing around and getting benchmark data (apples-to-apples versus a "plain" blocking pool).

• Uses our EnhancedQueueExecutor as the backing pool (instead of the JDK-default ForkJoinPool)
• Global, all-or-nothing switch
• Unknown performance impact
• Unknown memory impact
• Should improve thread density
• All integration tests run with the virtual thread facade, for the purposes of testing

/cc @franz1981, @cescoffier

[dmlloyd]

Look for this message in the logs:

2024-05-06 13:09:56,707 WARN  [io.qua.thread-pool] (main) Enabling experimental virtual thread blocking pool. Good luck!