feat: Integrate stripe

[pointearth]

Description

#1186
Add camel/toolkits/stripe_toolkit.py

Motivation and Context

• Add stripe toolkit
• Need to be checked if the solution fit expected design

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• New feature (stripe support, including some read-only functions as the first step)
• Documentation (update in the documentation)
• Unit Tests

Implemented Tasks

• CustomerAdapter (get_customer, list_customers)
• BalanceAdapter (get_balance,list_balance_transactions)
• PaymentAdapter (get_payment, list_payments)
• RefundAdapter (get_refund, list_refunds)
• Aggregate functions into the class StripeToolkit
• Provide a base class StripeBaseAdapter to wrap base functions for Adapters
• .env
• pyproject.toml

Checklist

• I have read the CONTRIBUTION guide. (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly. (required for a bug fix or a new feature)
• I have updated the documentation accordingly.

[NeilJohnson0930]

Great work on the code so far! Have you considered adding a verification step for conversations between humans and agents to ensure security when using the transaction function?

[Wendong-Fan]

Thanks @pointearth and sorry for the late review, left some comments below and added one more commit here 9aac0cd based on the comment, please feel free to review the change, currently there's one error error: Module "stripe.error" has no attribute "StripeError", which also lead the unit test not passing, could you help check this part further? Thanks!

[Wendong-Fan]

Thanks @pointearth ! LGTM