Let specific version of secrets be selected

[FlorianBuchegger]

Feature Request

To make updating secrets less cumbersome, it would be nice to be able to specify the version of the secret in the plugin.
It could look like this:

def mySecret = [path: 'myPath/mySecret', version: 1, secretValues: [
    [envVar: 'SECRET_VAL', vaultKey: 'SECRET_KEY']]]

[jzilske]

It would also be helpful if the plugin logged which version of a given secret was retrieved (cf.

hashicorp-vault-plugin/src/main/java/com/datapipe/jenkins/vault/VaultAccessor.java

Line 207 in 48134f6

logger.printf("Retrieving secret: %s%n", path);

)