feat(rust/immutable-ledger): block encoding decoding and validation #461

Job	Run time
ci / discover	15s
ci / check / .+check-markdown	54s
ci / check / .+check-spelling	57s
ci / check / ./docs/src/architecture/08_concepts/catalyst_voting/cddl+check-cddl	27s
ci / check / ./docs/src/architecture/08_concepts/immutable_ledger/cddl+check-cddl	35s
ci / check / ./rust+check	58s
ci / check / ./rust+check-builder-src-cache	50s
ci / build	0s
ci / package	0s
ci / test	0s
ci / release	0s
ci / docs	0s
ci / publish	0s
ci / final	0s
ci / deploy	0s
	4m 56s

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