Better mutants testing #1180

Job	Run time
clippy	19s
quick-test	2m 30s
build-large-tests	1m 2s
check-all-features	24s
rustfmt	12s
pr-mutants	19s
tests (ubuntu-latest, stable)	1m 15s
cargo-mutants (0)	20m 51s
tests (ubuntu-latest, nightly)	1m 7s
cargo-mutants (1)	21m 45s
tests (ubuntu-latest, 1.74)	1m 21s
tests (ubuntu-latest, s3, stable)	1m 42s
cargo-mutants (2)	19m 28s
tests (ubuntu-latest, s3, nightly)	1m 19s
cargo-mutants (3)	17m 16s
tests (ubuntu-latest, s3, 1.74)	1m 49s
tests (windows-latest, stable)	2m 10s
tests (windows-latest, nightly)	2m 21s
tests (windows-latest, 1.74)	2m 32s
tests (windows-latest, s3, stable)	3m 5s
tests (windows-latest, s3, nightly)	2m 42s
tests (windows-latest, s3, 1.74)	3m 37s
tests (macOS-latest, stable)	3m 7s
tests (macOS-latest, nightly)	3m 23s
tests (macOS-latest, 1.74)	3m 5s
tests (macOS-latest, s3, stable)	2m 48s
tests (macOS-latest, s3, nightly)	3m 46s
tests (macOS-latest, s3, 1.74)	3m 19s
	2h 8m 34s

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