feat: consume prototype schema for new home view sections

[anandaroop]

This is the counterpart to https://github.com/artsy/metaphysics/pull/5848 — see that description for more details.

Description

Stubs in a new HomeView screen at the home-view route, so that we can safely iterate on the proposed new schema without touching or being constrained by existing home feed logic.

As of now this just renders some placeholders. A next step would be to actually render some content based on the response coming from homeView.sectionsConnection

(I'm having trouble bring this up in an Android sim, hoping someone else can confirm — would require access to the new MP schema either locally or in staging)

PR Checklist

• [ ] I have tested my changes on iOS and Android.
• [x] I hid my changes behind a feature flag, or they don't need one.
• [x] I have included screenshots or videos, or I have not changed the UI.
• [x] I have added tests, or my changes don't require any.
• [x] I added an app state migration, or my changes do not require one.
• [x] I have documented any follow-up work that this PR will require, or it does not require any.
• [x] I have added a changelog entry below, or my changes do not require one.

To the reviewers 👀

• [x] I would like at least one of the reviewers to run this PR on the simulator or device.

Changelog updates

### Changelog updates #### Cross-platform user-facing changes - #### iOS user-facing changes - #### Android user-facing changes - #### Dev changes - A new sandbox screen at `home-view` route for iterating on the new dynamic home view schema - Roop

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[ArtsyOpenSource]

This PR contains the following changes:

• Dev changes (A new sandbox screen at home-view route for iterating on the new dynamic home view schema - Roop)

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