tmf.tests: Add tests for TmfStateSystemModule#isQueryable(long)

tmf.tests: Add tests for TmfStateSystemModule#isQueryable(long)

This forces to add behavior to the test state provider so it is possible to
fine tune the event processing by adding a method to process events one at a
time and signal the provider to process the next event.

Change-Id: I999ccd8494c90efce42ba1dc9d59d73b8d018a84
Signed-off-by: Geneviève Bastien <gbastien+lttng@versatic.net>
Reviewed-on: https://git.eclipse.org/r/71153
Reviewed-by: Hudson CI
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>