feat: add DecodedProofNodes struct #249

Job	Run time
feature-checks	15s
docs	14s
clippy	19s
fmt	13s
miri --no-default-features	4m 9s
miri	4m 8s
miri --all-features	4m 32s
test stable --no-default-features	12s
test stable	10s
test stable --all-features	37s
test beta --no-default-features	18s
test beta	16s
test beta --all-features	40s
test nightly --no-default-features	18s
test nightly	20s
test nightly --all-features	38s
test 1.81 --no-default-features	14s
test 1.81	14s
test 1.81 --all-features	26s
deny / cargo deny check	14s
	18m 27s

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