This commit fixes all 1533 PHPCS errors that PHPCBF can fix automatically in the tests/ directory. Before this change there was a total of 3106 PHPCS errors in the WooCommerce repository and now there is 1573 errors.
Payment tokens was introduced in 2.6 and was updated to use the new CRUD code while some of the CRUD system was still in flux.
While most things were correct, the prop handling for custom fields (like a card's last 4 digits) were directly calling meta functions, instead of delegating to the data store/parent.
This PR moves these props to `extra_data` and follows the same pattern as product types or order items. It also updates some version tags to 3.0.0. Finally, it adds an additional test for saving meta after a create which looks like it was lacking.
To Test:
* Run `phpunit`.
* Go to the "My Account" tab and add a new payment method. You need a payment gateway that supports this, like Simplify.
* Test the add a payment method flow.
* Make a test purchase using the saved payment method.
* Fix up some comments to match other comments in the WC code base
* Add some missing esc_* functions
* Add a gateway filter to get_customer_tokens + a test for it
Rodrigo Primo
Justin Shreve
Aristeides Stathopoulos
Mike Jolley