Tests

fix: add ToString for no_std add exports some types in no_std #2743

Job	Run time
test stable --no-default-features	43s
test stable	47s
check no-default-features	16s
test stable --all-features	1m 6s
check serde	25s
test beta --no-default-features	49s
check std	17s
test beta	46s
docs	1m 18s
test beta --all-features	1m 5s
fmt	8s
test nightly --no-default-features	1m 4s
clippy	1m 11s
test no_std	30s
test nightly	1m 0s
test nightly --all-features	54s
	12m 19s

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