Stabilize AWS IoT module

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### Overview:

AWS IoT provides secure, bi-directional communication between Internet-connected devices such as sensors, actuators, embedded micro-controllers, or smart appliances and the AWS Cloud. This enables you to collect telemetry data from multiple devices, and store and analyze the data. You can also create applications that enable your users to control these devices from their phones or tablets.

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

### Issues:

All open IoT issues can be found [here](https://github.com/aws/aws-cdk/issues?q=is%3Aopen+is%3Aissue+label%3Apackage%2Fiot)

Start with the linked AWS IoT documentation and CDK API Reference, then review the open IoT issues listed in the issue body. The issue does not name files, tests, or a concrete construct scope, so the implementation and completion criteria need to be defined before work can begin.

Written by the indexing model from the issue text.