Add new module to install and configure AWS CLI

Create a new module that automates the installation and basic configuration of the AWS CLI. This module should:

- Download and install the latest stable AWS CLI package
- Support popular operating systems (Linux, macOS, Windows)
- Document prerequisites and installation steps
- Optionally allow configuration of default credentials/profile via environment variables
- Provide example usage and verify installation in a post-step

Resources:
- [AWS CLI Official Docs](https://docs.aws.amazon.com/cli/latest/userguide/cli-chap-install.html)
- [AWS CLI Configuration Docs](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-quickstart.html)

This will expand the registry to better support cloud automations and simplify workflows for users needing AWS capabilities.