chore(alloy): re-export `alloy-core` items individually #801

Job	Run time
docs	1m 50s
clippy	1m 35s
feature-checks	4m 6s
fmt	13s
wasm	1m 20s
test stable --no-default-features	2m 0s
test stable	2m 7s
test stable --all-features	2m 23s
test nightly --no-default-features	2m 30s
test nightly	2m 36s
test nightly --all-features	2m 35s
test 1.75 --no-default-features	1m 23s
test 1.75	1m 51s
	26m 29s

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