Stress test LRA (including Bulkhead)

[marcosgopen]

replaces https://redhat.atlassian.net/browse/JBTM-3984

From the linked forum message posted by Mike: "the bulkhead annotation is configurable and a good while back I tested it by running 64 concurrent requests to start an LRA. We should set up regular stress testing of this and other features."

[marcosgopen]

For more information see jbosstm/lra#363 and https://narayana.zulipchat.com/#narrow/channel/323715-developers/topic/Running.20an.20LRA.20coordinator.20from.20a.20checkout.20of.20Narayana.20LRA/with/604229088