Provide SYSTEM priority thread executor for reload (See #11033) (rebased onto dev_4_4)



This is the same as gh-1247 but rebased onto dev_4_4.

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Along with the other resource contention issues seen under 11033,
a number of imports performing stats calculation led to SM.reload()
blocking. Since this is called by getEventContext() all of the
joinSessions from OMERO.web were blocked, completely breaking the
client.

Now, a special `ExecutorService` is available for high-priority
threads. It will grow without bound, but threads will be cached
and reaped as necessary. A better implementation might try to
use a single thread pool, but save a few slots of system threads.