cmd/pprof: don't print binary outputs in interactive mode

cmd/pprof: don't print binary outputs in interactive mode

Some commands generate binary outputs which are not human readable.
In interactive mode, there are no use-cases for such outputs.
Instead, the new code writes it to the temporary file on the $CWD and
shows the file name. So the user can use any program to display the
file outside interactive shell.

Fixes #17465

Change-Id: I5c479db26017607f7a28eafbff2385533e5c584e
Reviewed-on: https://go-review.googlesource.com/31123
Reviewed-by: Russ Cox <rsc@golang.org>