Add woocommerce_order_get_tax_location filter

[leanzafrancesco]

All Submissions:

• Have you followed the WooCommerce Contributing guideline?
• Does your code follow the WordPress' coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

This PR adds woocommerce_order_get_tax_location filter in WC_Abstract_Order::get_tax_location.
This way it'll be possible to filter the tax location, for example, based on a specific meta of the order.
Example: This could be useful if I want to set different tax locations for each order: maybe I'm creating orders through a plugin (or through REST API) and I want to set the tax location depending on the place where I am, so I can filter that value through the new woocommerce_order_get_tax_location filter.

How to test the changes in this Pull Request:

1. create different tax rates lines based on different countries (for example 23% for Italy and 10% for Spain)
2. use the woocommerce_order_get_tax_location filter to set country, state, postcode and city, based on some specific order meta
3. try to create different orders programmatically or through REST API, by using different order meta to specify the tax location for the orders.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?

Changelog entry

Dev: added woocommerce_order_get_tax_location filter

[rodrigoprimo]

Looks good to me. Thanks for your contribution.