feat: delegate Chain methods to NamedChain #22

Job	Run time
docs	12s
feature-checks	11s
clippy	21s
fmt	10s
miri --no-default-features	37s
test stable --no-default-features	14s
miri	43s
wasm	8s
test stable	10s
miri --all-features	43s
test stable --all-features	11s
test beta --no-default-features	14s
test beta	14s
test beta --all-features	19s
test nightly --no-default-features	12s
test nightly	19s
test nightly --all-features	15s
test 1.65 --no-default-features	24s
test 1.65	24s
	6m 1s

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