AINFRA-469 - Simplify Storage into a Swift package - Sources only

[mokagio]

Description

Steps to reproduce

Testing information

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.

[dangermattic]

	2 Warnings
:warning:	Modules/Package.swift was changed without updating its corresponding Package.resolved. Please resolve the Swift packages as appropriate to your project setup (e.g. in Xcode or by running swift package resolve).
:warning:	This PR is larger than 300 lines of changes. Please consider splitting it into smaller PRs for easier and faster reviews.

Generated by :no_entry_sign: Danger

[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	30604
	Version	PR #15755
	Bundle ID	com.automattic.alpha.woocommerce
	Commit	045d09134efed188d79d5f89e3acd66f8301e53f
	Installation URL	6kgncn9924veg

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