perf report: Support running scripts for current time range

When using the time sort key, add new context menus to run scripts for
only the currently selected time range. Compute the correct range for
the selection add pass it as the --time option to perf script.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20190311144502.15423-6-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>