fix(medusa): Query SalesChannel Products in storefront

[olivermrbl]

What

• Adds the ability to query products in a sales channel from a storefront
• Adds feature flag decorator to query param sales_channel_id in GET /admin/products as the feature is still guarded

Tests

• Retrieve products in specific channel
• Retrieve products in multiple channels
• Retrieve all products when no channel is defined

Fixes CORE-602.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0831627

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[adrien2p]

LGTM

[srindom]

LGTM

[srindom]

@olivermrbl - maybe add a changeset?

[olivermrbl]

maybe add a changeset?

PRs that include changes guarded by feature flags generally should not have a changeset