add images to product collections

[edihasaj]

add thumbnail and image properties to product-collection.ts. add api endpoint changes for managing thumbnail and image. add migration changes for product collection images add new endpoint for querying collection with products and images included (joined) /store/collections/:id/products add integration test for new created endpoint. add docs changes for product-collection entity changes add docs for the new added endpoint.

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Latest commit: 069c0ae66f42be09a9969686d58e7e7af80669a6

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[edihasaj]

@srindom Is this okay?

changes are based on PR #1767 and #1769

[edihasaj]

I am also developing the remaining part in integrating medusa admin with the added functionality above.

[edihasaj]

Requested functionality for querying imageRepository from DI, doesn't recognize the upsertImages() method, so I'm converting the services/product-collection.js to typescript. I'll test it and I'll let you know for review continutation

[edihasaj]

@kasperkristensen you can now review the changes.