Fintoc

Fixes 🐛

- Fix non-`HTTPStatusError` exceptions in `httpx`, improving error handling.

Additions ➕

- You can now initialize the `Fintoc` client with an `api_version` attribute, where you can pass a specific Fintoc API version.

Additions ➕

- Create a Charges manager
- Create a Subscription Intents manager
- Add the Subscription manager to the base Fintoc object

Fixes 🐛

- Datetimes are now parsed with or without miliseconds as a temporary fix while the API standardizes the format

Changes ➖

- Date serialization has now the same format as the one coming directly from the API.

Fixes 🐛

- The SDK now no longer incorrectly parses strings into dates.
- The `dateutil` dependency was removed.

Additions ➕

- Payment Intents are now supported through the `payment_intents` manager located on the `Fintoc` class 🎉