ioengines: Implement dircreate, dirstat, dirdelete engines #738

Job	Run time
build (linux-gcc)	9m 29s
build (linux-clang)	9m 57s
build (macos)	8m 56s
build (linux-i686-gcc)	8m 58s
build (android)	1m 33s
build (windows-cygwin-64)	11m 48s
build (windows-cygwin-32)	12m 5s
build (windows-msys2-64)	10m 7s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	38s
	1h 13m 31s

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