Load product salability data on-demand

[novikor]

Can and must be delivered together with #3243: Product Salability Improvements branch

Summary (*)

Product salability data should not be loaded every time on product load, on-demand only. See \Magento\CatalogInventory\Observer\AddInventoryDataObserver.

Examples (*)

• Current behavior can lead to performance degradation;
• It is required change to resolve #3200: Composite products support for IsProductSaleable

Proposed solution

• Disable \Magento\CatalogInventory\Observer\AddInventoryDataObserver
• Remove \Magento\InventoryBundleProduct\Plugin\CatalogInventory\Helper\Stock\AdaptAssignStatusToProductPlugin
• Remove \Magento\InventoryConfigurableProduct\Plugin\CatalogInventory\Helper\Stock\AdaptAssignStatusToProductPlugin
• Remove \Magento\InventoryCatalog\Plugin\CatalogInventory\Helper\Stock\AdaptAssignStatusToProductPlugin
• Call AreProductsSalable service in a plugin on $product->isAvailable() method in order to preserve current logic. See #3039 Async Salable Status, it is partially implemented there, so some commits should be cherry-picked.

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