feat(core): add `if_not_exist` in `OpWrite` #2010

Job	Run time
build_all_platforms (ubuntu-latest)	3m 21s
build_all_features	4m 48s
build_all_platforms (macos-latest)	2m 22s
build_all_platforms (windows-latest)	6m 59s
build_default_features (ubuntu-latest)	36s
build_under_wasm	51s
build_default_features (macos-latest)	41s
check_clippy	4m 22s
build_default_features (windows-latest)	1m 17s
check_docs	3m 59s
check_msrv	36s
unit	7m 5s
	36m 57s

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