Introduce interface to calculate remaining validity and renewal for a Lease using `SecretLeaseContainer` about spring-vault HOT 3 OPEN

    class VaultForJdbc {
        private static SecretLeaseContainer secretLeaseContainer;

        static {
            VaultTemplate vaultTemplate = new VaultTemplate(VaultEndpoint.create("http://127.0.0.1", 1234));
            SecretLeaseContainer secretLeaseContainer = new SecretLeaseContainer(vaultTemplate);
            secretLeaseContainer.afterPropertiesSet();
            secretLeaseContainer.start();
            VaultForJdbc.secretLeaseContainer = secretLeaseContainer;
        }
        
        private static Map<RequestedSecret, LeaseAwareVaultPropertySource> map = new ConcurrentHashMap<>();
        
        public static LeaseAwareVaultPropertySource requestSecret(RequestedSecret requestedSecret) {
            return map.computeIfAbsent(requestedSecret, k -> new LeaseAwareVaultPropertySource(secretLeaseContainer, requestedSecret));
        }
    }

    public static void main(String[] args) {
        LeaseAwareVaultPropertySource propertySource = VaultForJdbc.requestSecret(RequestedSecret.rotating("/database/readwrite"));
        Object username = propertySource.getProperty("username");
        Object password = propertySource.getProperty("password");
    }