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Fix JVM shutdown deadlock when closing JEP Python interpreters (#1506)

The shutdown hook closed Jep instances from the hook thread, but JEP only allows an interpreter to be closed by the thread that created it: every close() threw "Unsafe close() of Python sub-interpreter" and the interpreter was never torn down, leaving the JVM parked forever after DeLFT evaluations completed.

- delegate the close to the executor worker thread that owns the Jep instance, with a bounded wait
- make the executor threads named daemons so a wedged interpreter can never block JVM exit
- make shutdown() idempotent via AtomicBoolean instead of synchronized, removing a monitor deadlock between the hook thread and the worker
- replace the busy-wait in JEPThreadPoolClassifier.run() with future.get() and exception propagation, matching JEPThreadPool

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