chore: rename Chain to NamedChain (#3) #9

Job	Run time
feature-checks	9s
miri --no-default-features	32s
test stable --no-default-features	10s
miri	48s
wasm	9s
test stable	9s
miri --all-features	1m 0s
test stable --all-features	14s
clippy	13s
test beta --no-default-features	14s
docs	12s
test beta	16s
test beta --all-features	17s
fmt	10s
test nightly --no-default-features	14s
test nightly	15s
test nightly --all-features	19s
test 1.65 --no-default-features	25s
test 1.65	16s
	6m 2s

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