Rename delay_for to sleep #985

Job	Run time
docs	1m 55s
clippy	1m 46s
runefmt	1m 50s
rustfmt	14s
basics	1s
miri_rune	4m 56s
msrv	1m 53s
miri_rune_alloc	4m 57s
build_feature (capture-io)	52s
no_default_features	54s
no_std_minimal	2m 59s
build_feature (cli,doc)	1m 30s
wasm	1m 6s
build_feature (cli,fmt)	1m 32s
build_feature (cli)	1m 31s
build_feature (workspace)	54s
build_feature (languageserver)	1m 21s
build_feature (byte-code)	54s
test	1s
	31m 6s

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