add type alias in direction module and depreciated IteratorDirection #434

Job	Run time
coverage / coverage	1h 32m 32s
rustdoc check / Rust Doc check	35s
check the format of the code / check the format of the code	15s
rust test (ubuntu-latest, test) / rust test	3m 32s
rust test (ubuntu-latest, release) / rust test	3m 51s
rust test (windows-latest, test) / rust test	3m 33s
lint code on nightly release	0s
publish rust doc	0s
benches	0s
	1h 44m 18s

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