Stabilize AWS Redshift module

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### Overview:

Welcome to the Amazon Redshift Getting Started Guide. Amazon Redshift is a fully managed, petabyte-scale data warehouse service in the cloud. An Amazon Redshift data warehouse is a collection of computing resources called nodes, which are organized into a group called a cluster. Each cluster runs an Amazon Redshift engine and contains one or more databases.

[AWS Docs](https://docs.aws.amazon.com/redshift/latest/gsg/getting-started.html)

### Maturity: CloudFormation Resources Only

See the [AWS Construct Library Module Lifecycle doc](https://github.com/aws/aws-cdk-rfcs/blob/master/text/0107-construct-library-module-lifecycle.md) for more information about maturity levels.

### Implementation:

See the [CDK API Reference](https://docs.aws.amazon.com/cdk/api/latest/docs/aws-redshift-readme.html) for more implementation details.

### Issue list:

No source files or tests are named. Start with the linked AWS Redshift Getting Started Guide, AWS Construct Library Module Lifecycle document, and CDK API Reference; clarify the constructs and features intended for stabilization, then define the in-scope issue list and target maturity.

Written by the indexing model from the issue text.