fix(rust/cardano-blockchain-types): Add const, display, and condition check for `Fork` #944

Job	Run time
ci / discover	17s
ci / check / .+check-markdown	1m 8s
ci / check / .+check-spelling	48s
ci / check / ./docs/src/architecture/08_concepts/catalyst_voting/cddl+check-cddl	28s
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	32s
ci / check / ./rust+check	55s
ci / check / ./rust+check-builder-src-cache	41s
ci / build	0s
ci / package	0s
ci / test	0s
ci / docs	0s
ci / release	0s
ci / final	0s
ci / deploy	0s
test_reporting / Generate test reports	5m 23s
test_reporting / Generate allure report	0s
test_reporting / Generate coverage report	0s
test_reporting / Upload coverage report	4s
	10m 45s

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