Implement a Dwh construct to abstract Redshift and helpers

[vgkowski]

Currently, there is no Dwh abstraction in the Analytics Reference Architecture and you need to provision Redshift L2 Construct with lots of additional resources to get a complete and usable setup.

We can implement a new construct called Dwh which bundle all the required resources with defaults but still customizable. It can be composed of:

• Redshift cluster with a default parameter group (multiple priority queues, concurrency scaling,
• KMS key for data encryption
• Bucket for logs (should be an AraBucket singleton 'redshift-access-logs')
• Default WLM configuration
• IAM role for Spectrum
• Schema pointing to Glue catalog
• Default users for ETL, data engineer, data analyst, data scientist

Points to be investigated:

• L2 alpha versus L1 Cfn based construct
• Need for SSL enforcement
• IAM authentication vs secret manager username/password