Calculate cost of a given benchmark

[daverigby]

Calculate the cost of running a given workload against a particular database.

This calculation will vary depending on the kind of database:

• Self-hosted (e.g. pgvector): Cost per month for the VM(s) required to run the workload, plus any additional storage cost (e.g. EBS)
• Cloud-hosted, server-based (e.g. Pinecone Pods): Cost per month of the number of nodes needed to run the workload, plus any additional storage if billed separately.
• Cloud-hosted, serverless (e.g. Pinecone Serverless): Number of compute units consumed to ingest the data (e.g. Write units); plus ongoing cost per month to handle the requested workload (e.g. Read/Write units for performing queries + data storage costs)

May be hard to compare Serverless to non-serverless, as Serverless may scale arbitrarily (e.g. max QPS may be very high, but also cost a lot), so have to pick some target QPS and then see what the cost & latency is at that point.