Add a global configuration `config::Config` with `validate_checksums`… #142

Job	Run time
codecov	2m 1s
clippy	35s
build (stable, --features "")	38s
build (stable, --all-features)	1m 45s
build (stable, --no-default-features)	23s
test	1m 38s
fmt	17s
build (1.71, --features "")	41s
build (1.71, --all-features)	1m 52s
build (1.71, --no-default-features)	31s
build (beta, --features "")	35s
build (beta, --all-features)	1m 41s
build (beta, --no-default-features)	32s
build (nightly, --features "")	40s
build (nightly, --all-features)	1m 51s
build (nightly, --no-default-features)	35s
	16m 15s

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