Shipping Labels: Persist origin addresses upon fetching from remote

[itsmeichigo]

Part of WOOMOB-627

Description

This PR adds a new Core Data entity for WooShippingOriginAddress and updates WooShippingStore to persist origin addresses in the local storage.

In the next PR, label purchase form will be updated to fetch addresses from the storage.

Testing steps

• Build and run the app. Confirm that the app doesn't crash with the new entity added.
• Log in to a test store with Woo Shipping extension set up.
• Navigate to the Orders tab and select an order eligible for creating labels.
• Select Create shipping label and confirm that origin addresses can still be loaded successfully.

Testing information

• Tested and confirmed with simulator iPhone 16 iOS 18.4.
• Added unit tests for Core Data migration and persisting origin addresses.

Screenshots

No UI changes.

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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 Prototype by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce iOS Prototype
	Build Number	pr15932-367c36a
	Version	22.8
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	367c36a
	Installation URL	27a6aagu4asp0

Automatticians: You can use our internal self-serve MC tool to give yourself access to those builds if needed.

[RafaelKayumov]

LGTM. Works as described.