[Feature request] Add "cleanup" parameter to snapshot operation

[eliskovets]

Description

That's not a bug, but a feature request.

It would be nice to have an additional parameter for snapshot operation that would cause the deletion of existing data in the snapshot_path directory.

Something like cleanup=true:

curl "http://localhost:8108/operations/snapshot?cleanup=true&snapshot_path=/tmp/typesense-data-snapshot" -X POST \
-H "Content-Type: application/json" \
-H "X-TYPESENSE-API-KEY: ${TYPESENSE_API_KEY}"

My case is that I don't need old snapshots and only need to keep the current. I save Typesense snapshots as EBS volume snapshots. Old Typesense snapshots in my case take extra space and I have to manage their deletion separately (on the pod level). It would be great to have such an option as a part of the Typesense snapshot operation instead.