Optional auto rotating/renewing certificates #40

One of the key features of csi-lib is Automatically rotating/renewing certificates near expiry.
But do we consider make this feature optional?

One particular use case is: one-time and short-lived cert for init-container (for mTLS to pull some secrets).
The user container will no longer need the cert after consuming it. Since the pod is still running, csi-lib will continue the renewal logic for this short-lived cert. With least privilege guidance, shall we disable the renewal in this case ?

Upon checking the code, all certificates will be auto renewed once it hits the NextIssuanceTime:
https://github.com/cert-manager/csi-lib/blob/v0.3.0/manager/manager.go#L499
A workaround is to set the NextIssuanceTime much longer than the pod lifetime. But add an option here (pass in as volumeAttribute) would be much cleaner logic.