Thinking about disaster recovery

# What is currently missing?

Since we have all the data needed in S3 already (including the [log data and the metadata](https://github.com/Aiven-Open/tiered-storage-for-apache-kafka/issues/158)), it can be of great help if we can just recover from the shutdown of the cluster, and launch the new cluster to use the same topic folder(prefix_randomstring) in S3. For the new cluster, we can consume from the oldest offset from the old topic folder. In this way, we can fully achieve the disaster recovery.

# How could this be improved?

Some suggestions:
1.Enable the topic can be created with designated folder (with random string) in S3 in the new cluster;
2.The new message for the topic can be stored in the older folder

# Is this a feature you would work on yourself?

I haven't take a look for the actual code part, but if someone can point me to the proper code link, I'd be happy to start looking.