fix: disallow leading zeros in RLP decoding #765

Job	Run time
Cargo deny check	28s
Clippy	1m 19s
Coverage	5m 20s
Docs	1m 13s
Feature checks	1m 15s
Fmt	20s
test (stable, --no-default-features)	2m 54s
test (stable)	3m 9s
test (stable, --all-features)	4m 16s
test (beta, --no-default-features)	1m 59s
test (beta)	2m 23s
test (beta, --all-features)	3m 47s
test (nightly, --no-default-features)	1m 59s
test (nightly)	2m 0s
test (nightly, --all-features)	4m 10s
test (1.65, --no-default-features)	3m 2s
test (1.65)	3m 4s
Accept	7s
	42m 45s

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