Stabilize AWS Service Catalog module

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### Overview:

AWS Service Catalog enables organizations to create and manage catalogs of products that are approved for use on AWS.

[AWS Docs](https://docs.aws.amazon.com/servicecatalog/latest/dg/what-is-service-catalog.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-servicecatalog-readme.html) for more implementation details.

### Issue list:

Start with the AWS Docs, CDK API Reference, and module lifecycle document linked in the issue, then review the package README.md and the issue-list checklist. Done means the module’s intended constructs and in-scope work are documented clearly enough to assess its maturity against the lifecycle guidance.

Written by the indexing model from the issue text.