(gdk): Add support for AWS Profiles

[ctodd]

Feature Description
Add CLI argument --profile to support AWS credential profiles

Use Case
GDK uses the default profile in ~/.aws/credentials. This requires updating the credentials file manually when switching between projects, and accidental attempts to deploy in the wrong environment, which thankfully fail.

Proposed Solution
Add a --profile argument so that gdk aligns with other AWS tools like aws-cli

• 👋 I may be able to implement this feature request
• ⚠️ This feature might incur a breaking change

[cole-jxn]

Any status on this? This would be a great feature!