build

Add a global configuration `config::Config` with `validate_checksums`… #143

Job	Run time
clippy	39s
fmt	20s
test	1m 34s
build (stable, --features "")	1m 11s
build (stable, --all-features)	1m 51s
build (stable, --no-default-features)	22s
build (1.71, --features "")	57s
codecov	2m 7s
build (1.71, --all-features)	1m 57s
build (1.71, --no-default-features)	29s
build (beta, --features "")	35s
build (beta, --all-features)	1m 38s
build (beta, --no-default-features)	28s
build (nightly, --features "")	41s
build (nightly, --all-features)	2m 4s
build (nightly, --no-default-features)	27s
	17m 20s

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