Automate AWS CLI installation and updates in setup.sh

## Overview
Add automated installation and update functionality for AWS CLI in setup.sh, similar to how we currently handle GitHub CLI and the proposed Google Cloud CLI automation.

## Current Behavior
- AWS CLI must be manually installed and updated
- No consistent installation process across different machines
- Doesn't follow our "spilled coffee" principle for reproducibility
- Telemetry might be enabled by default, sending usage data to AWS

## Desired Behavior
- Detect if AWS CLI is installed, and install if missing
- Check for updates and apply them automatically during setup
- Follow the same pattern used for GitHub CLI in setup.sh
- Support multiple platforms (Debian/Ubuntu, Arch, macOS)
- Automatically disable telemetry/usage reporting

## Implementation Details
1. Add a function to detect AWS CLI installation
2. Add platform-specific installation commands
3. Add update mechanism for existing installations
4. Include proper error handling and user feedback
5. Disable telemetry collection after installation

### Example Implementation (for Debian/Ubuntu):
```bash
# Check for AWS CLI and install/update if needed
if ! command -v aws &> /dev/null; then
echo "Installing AWS CLI..."
curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
unzip awscliv2.zip
sudo ./aws/install
rm -rf aws awscliv2.zip

# Disable telemetry
aws configure set cli_follow_urlparam false
else
echo "Checking for AWS CLI updates..."
# Get current version
CURRENT_VERSION=$(aws --version | cut -d ' ' -f1 | cut -d '/' -f2)

# Get latest version from AWS
LATEST_VERSION=$(curl -s https://raw.githubusercontent.com/aws/aws-cli/v2/CHANGELOG.rst | grep -m 1 -o '[0-9]\+\.[0-9]\+\.[0-9]\+' || echo "0.0.0")

# Compare versions and update if needed
if [ "$CURRENT_VERSION" != "$LATEST_VERSION" ] && [ "$LATEST_VERSION" != "0.0.0" ]; then
echo "Updating AWS CLI from $CURRENT_VERSION to $LATEST_VERSION..."
curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
unzip awscliv2.zip
sudo ./aws/install --update
rm -rf aws awscliv2.zip
else
echo "AWS CLI is already up to date ($CURRENT_VERSION)"
fi

# Ensure telemetry remains disabled
aws configure set cli_follow_urlparam false
fi
```

## Additional Considerations
- Create a `.bash_aliases.aws` file for common AWS CLI commands and shortcuts
- Consider adding basic configuration options during setup
- Document the AWS CLI installation in the README.md
- Add a note about telemetry being disabled by default in our setup
- Consider adding support for AWS CLI profiles setup

## Related to
- Follows the same pattern as GitHub CLI automation
- Complements the Google Cloud CLI automation (issue #250)
- Supports our modular shell configuration approach
- Aligns with the "spilled coffee" principle
- Respects privacy by disabling telemetry collection

Start by reading setup.sh and the existing GitHub CLI automation, then compare the proposed Google Cloud CLI work in issue #250. Implement AWS CLI detection, installation and updates for Debian/Ubuntu, Arch and macOS with error handling and telemetry disabled; document the setup in README.md and verify each platform path.

Written by the indexing model from the issue text.