Cleanup quote GraphQL scheme

[naydav]

Removing of not used types

1. Remove duplication

applyCouponToCart(input: ApplyCouponToCartInput): ApplyCouponToCartOutput @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\Coupon\\ApplyCouponToCart")
removeCouponFromCart(input: RemoveCouponFromCartInput): RemoveCouponFromCartOutput @resolver(class: "\\Magento\\QuoteGraphQl\\Model\\Resolver\\Coupon\\RemoveCouponFromCart")

2. Remove unused and wrong type

input AvailableShippingMethodsOnCartInput {
    cart_id: String!
    customer_address_id: Int
    address: CartAddressInput
}

3. Remove unused and wrong type

input CartItemDetailsInput {
    sku: String!
    qty: Float!
}

[naydav]

#385