[Draft] Add order metadata in order creation to identify POS orders and set sales channel from the app

[jaclync]

Closes: #

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[dangermattic]

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[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce iOS by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS
	Build Number	pr15399-ba55f39
	Version	22.0
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	ba55f39
	App Center Build	WooCommerce - Prototype Builds #13381

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[wpmobilebot]

Version 22.1 has now entered code-freeze, so the milestone of this PR has been updated to 22.2.

[wpmobilebot]

Version 22.3 has now entered code-freeze, so the milestone of this PR has been updated to 22.4.

[jaclync]

Closed in favor of #15557 as the decided way to identify POS orders.