Feature Request: Custom success message

[twmbx]

https://github.com/Flutterwave/rave-woocommerce/blob/db639f41c311154aeb516725b3eafd7a9d4a58f1/includes/eventHandler.php#L36
https://github.com/Flutterwave/rave-woocommerce/blob/db639f41c311154aeb516725b3eafd7a9d4a58f1/includes/eventHandler.php#L37
https://github.com/Flutterwave/rave-woocommerce/blob/db639f41c311154aeb516725b3eafd7a9d4a58f1/includes/eventHandler.php#L41

It would be useful to be able to customise the message displayed to the customer on a successful payment.

The second parameter for wc_add_notice should perhaps also reflect the available Woo statuses; "success" or "error" where applicable and not just "notice" for all of them.