Add support for expiry_time for secret-manager module

[fulyagonultas]

Include the ´expiry_time´ for secrets in the secret-manager module. Currently, it does not support adding expiration for secret.

https://github.com/GoogleCloudPlatform/cloud-foundation-fabric/tree/master/modules/secret-manager

expire_time - (Optional) Timestamp in UTC when the Secret is scheduled to expire. This is always provided on output, regardless of what was sent on input. A timestamp in RFC3339 UTC "Zulu" format, with nanosecond resolution and up to nine fractional digits. Examples: "2014-10-02T15:01:23Z" and "2014-10-02T15:01:23.045123456Z". Only one of expire_time or ttl can be provided.

[deanosaurx]

I just made a PR to address this issue - #2373

[juliocc]

Fixed with #2373