tmf.core: Add a resolve method to IEventAspect with a block parameter

tmf.core: Add a resolve method to IEventAspect with a block parameter

That method can be implemented by aspects whose resolution depend on an
analysis and the result of the resolve may not be available at the time of
query.

Change-Id: I01f05b1eff4a5a6d56b9fd6375ba9ee7636e1a11
Signed-off-by: Geneviève Bastien <gbastien+lttng@versatic.net>
Reviewed-on: https://git.eclipse.org/r/71603
Reviewed-by: Hudson CI
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>