[Woo POS] Add order_attribution_source_type POS during order creation

[kidinov]

Should be done after introduction of the backend handling of this new value

pdfdoF-6dU-p2#comment-7342

From mobile apps, while creating an order, we set the _wc_order_attribution_source_type meta data key value as mobile_app to identify the orders created from the mobile apps.

Here is the backend Woo code that shows the Order origin value based on the source type. I am not sure whether this serves your purpose. Perhaps you can add a new source-type value to identify POS orders.

Thanks Sharma! I think creating a separate key for POS is definitely worth considering.

[dangermattic]

🚫 Please add a type label (e.g. type: enhancement) and a feature label (e.g. feature: stats) to this issue.