Deprecate serverless cluster resource

[charconstpointer]

With the recent change to ScyllaDB Cloud offering, serverless clusters are no longer possible to create, hence we should consider deprecating Serverless Cluster resource.

[rjeczalik]

@charconstpointer What should be used instead of serverless resource?

I don't see anything about free trial (or generalised - deals api) in the API https://cloud.docs.scylladb.com/stable/api.html#tag/Cluster/operation/createCluster.

While deprecating a resource we must provide what to use instead.

[rjeczalik]

I added a deprecation message in this commit: 467b384

[charconstpointer]

The cluster resource we already support is enough to replace what the serverless resource was offering to our users; i.e. primary purpose for serverless was to use it for free-tier clusters, to replicate this use case using cluster resource user needs to provide combination of:

• FreeTier(boolean)
• InstanceType(int)
• PU(processing units[int])
  We should recognize that this is not a great UX, user cannot just provide freeTier = true and assume their request will succeed.

[rjeczalik]

user needs to provide combination of

How and where?

[charconstpointer]

user needs to provide combination of

How and where?

Right, perhaps I should have been more specific, I was mostly referencing ScyllaDB Cloud Public API spec and cluster creation endpoints. Right now cluster resources does not support these properties, so our users won't be able to create free-tier cluster resources, in order to do that we could expose new properties for cluster resource:

• FreeTier(boolean)
• InstanceType(int/string) <= already taken care of by node_type
• PU(processing units[int])