feat: Several product interfaces added.

[kidunot89]

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What does this implement/fix? Explain your changes.

Adds 5 new product interfaces for cleaner product queries.

• DownloadableProducts
• InventoriedProducts
• ProductsWithPricing
• ProductsWithDimensions
• ProductsWithVariations

query ( $id: ID!, $format: PostObjectFieldFormatEnum ) {	product(id: $id) {	id	databaseId	name	slug	date	modified	status	featured	catalogVisibility	description(format: $format)	shortDescription(format: $format)	sku	dateOnSaleFrom	dateOnSaleTo	totalSales	averageRating	reviewCount	onSale	purchasable	link	reviewsAllowed	purchaseNote	menuOrder	... on ProductsWithPricing {	price	regularPrice	salePrice	taxStatus	taxClass	}	... on InventoriedProducts {	manageStock	stockQuantity	backorders	soldIndividually	backordersAllowed	stockStatus	}	... on ProductsWithDimensions {	weight	length	width	height	shippingClassId	shippingRequired	shippingTaxable	}	... on DownloadableProducts {	virtual	downloadExpiry	downloadable	downloadLimit	}	} } 

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Where has this been tested?

• WooGraphQL Version: …
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