examples: add fiograph plots for netio_vsock examples #781

Job	Run time
build (linux-gcc)	10m 53s
build (linux-clang)	9m 21s
build (macos)	8m 3s
build (linux-i686-gcc)	8m 51s
build (android)	32s
build (windows-cygwin-64)	12m 42s
build (windows-cygwin-32)	12m 17s
build (windows-msys2-64)	11m 32s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	35s
	1h 14m 46s

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