build

Add support for `miri` testing. #128

Job	Run time
fmt	27s
test	2m 0s
build (stable, --features "")	37s
clippy	33s
build (stable, --all-features)	1m 37s
build (stable, --no-default-features)	35s
build (1.71, --features "")	29s
build (1.71, --all-features)	1m 47s
build (1.71, --no-default-features)	30s
build (beta, --features "")	37s
build (beta, --all-features)	1m 48s
build (beta, --no-default-features)	28s
build (nightly, --features "")	51s
build (nightly, --all-features)	1m 55s
build (nightly, --no-default-features)	49s
	15m 3s

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