Add a helper function for proxying the online store from Hydrogen

[blittle]

Will be called useProxyOnlineStore. Must forward X-Shopify-Client-IP and X-Shopify-Client-IP-Sig headers.

[github-actions[bot]]

We detected some changes in packages/*/package.json or packages/*/src, and there are no updates in the .changeset. If the changes are user-facing and should cause a version bump, run npm run changeset add to track your changes and include them in the next release CHANGELOG. If you are making simple updates to examples or documentation, you do not need to add a changeset.

[shopify[bot]]

Oxygen deployed a preview of your replace-parcel-watcher-with-chokidar branch. Details:

Storefront	Status	Preview link	Deployment details	Last update (UTC)
Skeleton (skeleton.hydrogen.shop)	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 5, 2024 4:21 AM
optimistic-cart-ui	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 5, 2024 4:21 AM
classic-remix	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 5, 2024 4:21 AM
third-party-queries-caching	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 5, 2024 4:21 AM
metaobjects	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 5, 2024 4:21 AM
custom-cart-method	✅ Successful (Logs)	Preview deployment	Inspect deployment	July 5, 2024 4:21 AM

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