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

[jaclync]

Closes: #

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• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

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[dangermattic]

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📲 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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