Summary

This PR implements a new AWS SSO authentication system, integrates shared functionality into a reusable base class, updates documentation, and makes package dependency adjustments.

Main Changes:

New AWS SSO Login System:

• Added AwsSsoLogin, a new class for handling AWS SSO authentication using the Authorization Code + PKCE flow.
• Refactored shared functionality into AwsLoginBase for reuse between authentication implementations.
• Introduced login-aws-sso.js runner for invoking the AWS SSO login workflow.

Documentation Updates:

• Revamped AWS login documentation in getting-started.md and credentials.md to reflect the new "Sign in with AWS Console" workflow, deprecating long-term credentials in favor of short-lived ones.
• Enhanced explanation of AWS SSO configuration and serverless login aws sso.

New Files:

• aws-login-base.js, defining shared methods for login flows.
• aws-sso-login.js, implementing specific logic for AWS SSO.
• login-aws-sso.js, allowing CLI interaction for the new SSO login.

Dependency Updates:

• Added @aws-sdk/client-sso-oidc to support SSO workflows.

CLI Enhancements:

• Enhanced login commands to include sso as a subcommand for AWS SSO login.
• Improved CLI usability with options like sso-session and aws-profile.
  This PR modernizes AWS login workflows by unifying and expanding login approaches, improving security, and enhancing developer experience.