build

Move benchmarks to https://github.com/LDeakin/zarr_benchmarks #135

Job	Run time
fmt	35s
clippy	46s
build (stable, --features "")	1m 39s
test	1m 38s
build (stable, --all-features)	2m 43s
build (stable, --no-default-features)	1m 24s
build (1.80, --features "")	1m 32s
build (1.80, --all-features)	2m 45s
build (1.80, --no-default-features)	1m 40s
build (beta, --features "")	1m 35s
build (beta, --all-features)	2m 49s
build (beta, --no-default-features)	1m 17s
build (nightly, --features "")	2m 5s
build (nightly, --all-features)	3m 8s
build (nightly, --no-default-features)	2m 16s
	27m 52s

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