feat(aws): Add interactive region selection for discovery

[JuanKRuiz]

Description

This pull request introduces a critical usability enhancement by allowing the user to specify a single AWS region for the inventory scan.

1. The Problem (The Why)

The script's default behavior of iterating through all available AWS regions causes execution failures in corporate environments where Service Control Policies (SCPs) are enforced. When an SCP denies access to a non-enabled region—a common security and governance best practice—the script terminates abruptly with an UnauthorizedOperation error or similar. This completely blocks the tool's utility for users operating within these policy-restricted accounts.

2. The Solution (The How)

To address this blocker, an interactive workflow has been implemented at the script's startup:

• Interactive Prompt: The user is prompted to enter an AWS region.
• Scoped Scan (Single-Region): If a valid region is provided, the discovery scope is exclusively limited to that region. This prevents API calls to restricted regions, ensuring the script runs to completion.
• Default Behavior (Backwards Compatible): If the user presses ENTER without providing a region, the script retains its original behavior, scanning all available regions to ensure backward compatibility.

3. The Impact & Benefits (The Value)

• Unlocks Users: Enables engineers in organizations with robust security policies to use the tool without impediment.
• Increased Robustness: The script now proactively handles a common failure point in governed AWS environments.
• Operational Flexibility: Provides the option for a quick, targeted discovery in a single region in addition to the traditional full scan.