engines/fileoperations: add more description for file/directory opera… #805

Job	Run time
build (linux-gcc)	9m 56s
build (linux-clang)	10m 20s
build (macos)	8m 9s
build (linux-i686-gcc)	8m 42s
build (android)	34s
build (windows-cygwin-64)	12m 5s
build (windows-cygwin-32)	11m 34s
build (windows-msys2-64)	11m 12s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	33s
	1h 13m 5s

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