[Orders] Add ShippingLineRowView for order shipping lines

[rachelmcr]

Part of: #12582

Why

This adds a SwiftUI view for shipping lines in the order creation/editing form and order details.

How

Since we know we'll want to show a similar view in both places, I created this as a SwiftUI view that we can display in order details using a UIHostingConfiguration in a UITableViewCell.

The layout is similar to the CustomAmountRowView and it might be worth eventually creating a more reusable row view that supports a title, optional subtitle, value, and edit button.

Testing instructions

This view is not yet used in the UI. Different device configurations (color scheme, orientation, dynamic type) can be tested in the SwiftUI preview.

Screenshots

Editable	Not editable

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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.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 18.8. This milestone is due in less than 2 days. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

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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	pr12822-16e1ea0
	Version	18.7
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	16e1ea0
	App Center Build	WooCommerce - Prototype Builds #9222

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