feat: add `BytecodeLocked::original_bytecode` (#1037) #3

Job	Run time
check no-default-features	18s
check serde	19s
check std	17s
clippy	1m 18s
docs	1m 18s
fmt	11s
test no_std	19s
test stable --no-default-features	2m 1s
test stable	2m 3s
test stable --all-features	2m 2s
test beta --no-default-features	2m 14s
test beta	2m 4s
test beta --all-features	2m 9s
test nightly --no-default-features	2m 7s
test nightly	2m 4s
test nightly --all-features	2m 8s
	22m 52s

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