Create new CDK stack for Bulk Export

[ab295382]

Background

Create a new CDK stack for Bulk Export

Parent issue

• First version of bulk export capability #3446

Description

A new optional stack called the BulkExportStack. This will need to contain a queue for the export request. This request will be picked up by a lambda, which will act similarly to the query planner, i.e. break the request up into sub-export requests, one for each leaf partition. We will then need an ECS cluster to run tasks to process these sub requests. The scaling up of tasks can happen in the same way we scale up tasks in other situations, e.g. compactions.