[Watch] Order list UI

[Ecarrion]

closes #12499

Why

This PR Adds the UI for the my orders list screen

How

• Added tab view layout for the mail app
• Added split view layout for the orders list screen.
• Adds hardcoded UI

Screenshots

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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.

[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	pr12798-73148dc
	Version	18.7
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	73148dc
	App Center Build	WooCommerce - Prototype Builds #9159

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