thorium: add some message tracepoints

The high latency is due to a long waiting time between
message:worker_enqueue_message and
message:worker_dequeue_message tracepoints.

1x32

tracepoint message:actor_send 1139534104692223 ns
tracepoint message:worker_send 1139534104692313 ns (+ 90 ns)
tracepoint message:worker_send_mailbox - ns
tracepoint message:worker_send_schedule - ns
tracepoint message:worker_enqueue_message 1139534104692723 ns (+ 410 ns)
tracepoint message:worker_dequeue_message 1139534116557532 ns (+ 11864809 ns)  <===
tracepoint message:node_send 1139534116557581 ns (+ 49 ns)
tracepoint message:node_send_system 1139534116558118 ns (+ 537 ns)
tracepoint message:transport_send - ns
tracepoint message:transport_receive - ns
tracepoint message:node_receive - ns
tracepoint message:worker_receive 1139534116559474 ns (+ 1356 ns)
tracepoint message:actor_receive 1139534116561444 ns (+ 1970 ns)

4x8

tracepoint message:actor_send 1139605183333690 ns
tracepoint message:worker_send 1139605183333771 ns (+ 81 ns)
tracepoint message:worker_send_mailbox - ns
tracepoint message:worker_send_schedule - ns
tracepoint message:worker_enqueue_message 1139605183334075 ns (+ 304 ns)
tracepoint message:worker_dequeue_message 1139605189641290 ns (+ 6307215 ns)  <===
tracepoint message:node_send 1139605189641350 ns (+ 60 ns)
tracepoint message:node_send_system 1139605189641745 ns (+ 395 ns)
tracepoint message:transport_send 1139605189641856 ns (+ 111 ns)
tracepoint message:transport_receive 1139605189733422 ns (+ 91566 ns)
tracepoint message:node_receive 1139605189733725 ns (+ 303 ns)
tracepoint message:worker_receive 1139605189735770 ns (+ 2045 ns)
tracepoint message:actor_receive 1139605189737447 ns (+ 1677 ns)
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>

Link: https://github.com/GeneAssembly/biosal/issues/751
Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>