spring-cloud-gcp-pubsub - replaying and purging messages

**Is your feature request related to a problem? Please describe.**
Just a general question about spring-cloud-gcp-pubsub

**Describe the solution you'd like**
I can see Google Cloud Pub/Sub now offers the ability to seek/replay/purge messages. I am curiuos if this feature is/will be on the roadmap for spring-cloud-gcp-pubsub

**Describe alternatives you've considered**
Currently I'm using the vanilla googlecloud pubsub linbraries for their replay/seek feature

**Additional context**
https://cloud.google.com/pubsub/docs/replay-overview