Is your feature request related to a problem? Please describe.

If a store uses custom order numbers (e.g. with the Custom Order Numbers for WooCommerce plugin), you can't search by order number in the app. Trying to search by the custom order number doesn't return any results.

Describe the solution you'd like

By default, the order id and number attributes are matching, e.g. id is 123 (integer) and number is 123 (string).

However, using the plugin mentioned above the order can have different attributes, e.g. id is 123 and number is S123 with a prefix (or the numbers may not match at all). The Core REST API endpoint /wp-json/wc/v3/orders/<id> will return the custom order number as the number attribute, like this: {"id":123,"parent_id":0,"number":"S123", ...

The app should be able to search on that number field, not just the order ID.

Additional context

Searching by order ID	Searching by custom order number

Original report from a public beta tester, tested internally (internal ref: p5T066-1o1-p2#comment-5345)

Related iOS issue: woocommerce/woocommerce-ios#2507