feat(rust/signed-doc): Add deserializer for Catalyst Signed Documents #1022

Job	Run time
ci / discover	16s
ci / check / .+check-markdown	56s
ci / check / .+check-spelling	1m 6s
ci / check / ./docs/src/architecture/08_concepts/catalyst_voting/cddl+check-cddl	1m 16s
ci / check / ./docs/src/architecture/08_concepts/immutable_ledger/cddl+check-cddl	29s
ci / check / ./docs/src/architecture/08_concepts/signed_doc/cddl+check-cddl	29s
ci / check / ./rust+check	1m 15s
ci / check / ./rust+check-builder-src-cache	52s
ci / build	0s
ci / package	0s
ci / test	0s
ci / release	0s
ci / docs	0s
ci / deploy	0s
ci / final	0s
test_reporting / Generate test reports	4m 17s
test_reporting / Generate coverage report	0s
test_reporting / Generate allure report	0s
test_reporting / Upload coverage report	3s
	10m 59s

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