Expose Serde support for `ProofNodes` and `DecodedProofNodes` (#85) #256

Job	Run time
docs	27s
clippy	30s
feature-checks	28s
fmt	14s
miri --no-default-features	4m 27s
test stable --no-default-features	29s
miri	4m 26s
test stable	15s
miri --all-features	4m 33s
test stable --all-features	39s
test beta --no-default-features	21s
test beta	22s
test beta --all-features	43s
test nightly --no-default-features	35s
test nightly	35s
test nightly --all-features	46s
test 1.81 --no-default-features	15s
test 1.81	17s
test 1.81 --all-features	28s
deny / cargo deny check	19s
	21m 9s

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