Stripe agent toolkit support

[dot-agi]

Add support for stripe agent toolkit similar to crewAI and other frameworks:
https://stripe.dev/blog/adding-payments-to-your-agentic-workflows

[AtomSilverman]

@the-praxs, this is awesome. @bboynton97 is on it right now

[dot-agi]

Marking as completed by #50. Thanks @bboynton97.