ioengines: Implement dircreate, dirstat, dirdelete engines #786

Job	Run time
build (linux-gcc)	9m 28s
build (linux-clang)	10m 1s
build (macos)	8m 7s
build (linux-i686-gcc)	8m 21s
build (android)	1m 4s
build (windows-cygwin-64)	12m 19s
build (windows-cygwin-32)	11m 45s
build (windows-msys2-64)	10m 32s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	1m 5s
	1h 12m 42s

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