GraphQL gift registry schema

[paliarush]

In addition to creation of gift registry schema, some changes in cart were required to allow moving items from cart to gift registry (https://github.com/magento/architecture/pull/383/commits/a6404a455b34f8a616a050cfed5cff3586d9a018, https://github.com/magento/architecture/pull/383/commits/e3f8ea6514825d76c22ddbb0882bc805e1ddb044):

• Added customizable_options to CartItemInterface
• Added id_v2: ID to DownloadableProductLinks to identify specific link and be able to add it to gift registry
• Added child_sku to ConfigurableCartItem, need to be able to add to gift registry
• Making sure client does not have to generate hash of the option. It should be available to move items from cart to registry and wishlist
  • Fixed code style for the query/mutation arguments (https://github.com/magento/architecture/pull/383/commits/17ef7fe6831f92d494ad8a614879b9ce18d2fc05)
• Moved child_sku from bundle option to bundle option value (https://github.com/magento/architecture/pull/383/commits/fde0da37edea8bc79ee451d376ee530c9b2a7933)

Extended wishlist schema (https://github.com/magento/architecture/pull/383/commits/93eead7fbea6e98491e0534e1f7eff5d692f8ca4):

• Extended Wishlist schema to provide information about the selected options
• Fixed code style for the query/mutation arguments (https://github.com/magento/architecture/pull/383/commits/17ef7fe6831f92d494ad8a614879b9ce18d2fc05)

https://jira.corp.magento.com/browse/ECP-711

[DrewML]

Can you include screenshots of UI this should be providing coverage for?

[paliarush]

@DrewML regarding screenshots, gift registry UI is mostly described here https://docs.magento.com/user-guide/marketing/gift-registries.html