feat(rust/signed-doc): Add signing and verification logic to Catalyst Signed Docs #1239

Job	Run time
ci / discover	18s
ci / check / .+check-markdown	45s
ci / check / .+check-spelling	44s
ci / check / ./docs/src/architecture/08_concepts/catalyst_voting/cddl+check-cddl	35s
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	44s
ci / check / ./rust+check	54s
ci / check / ./rust+check-builder-src-cache	48s
ci / build / ./rust+build	5m 37s
ci / package	0s
ci / test	0s
ci / release	0s
ci / docs / ./docs+docs	56s
ci / final	4s
ci / deploy	0s
test_reporting / Generate test reports	57s
test_reporting / Generate allure report	22s
test_reporting / Generate coverage report	8s
test_reporting / Upload coverage report	3s
	13m 24s

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