Provide an improved syntax for projections

[patrick-steele-idem]

Examples of improvements:

QUERY:

select {
    count as totalCount,
    searchResult.items as items[{
        itemId as id, 
        label as label,
        primaryCategory.categoryName as categoryName,
        shippingInfo {
            shippingType,
            shipToLocation
        }
    }]
}
from finding

OUTPUT:

{
    totalCount: 100,
    items: [
        {
            id: 12345,
            label: 'Test',
            categoryName: 'Athletic',
            shippingInfo: {
                shippingType: "Calculated",
                shipToLocation: "US"
            }
        },
        ...
    ]
}

---

Also, an "anonymous" top-level array could be returned by dropping the label for "searchResult.items" as shown in the following query:

QUERY:

select searchResult.items as [{
    itemId as id, 
    label,
    primaryCategory.categoryName as categoryName,
    shippingInfo {
        shippingType,
        shipToLocation
    }
}]
from finding

OUTPUT:

[
    {
        id: 12345,
        label: 'Test',
        categoryName: 'Athletic',
        shippingInfo: {
            shippingType: "Calculated",
            shipToLocation: "US"
        }
    },
    ...
]

---

Also, I think a limit on any arrays should be supported. For example:

QUERY:

select {
    count as totalCount,
    searchResult.items as items[limit=5, {
        itemId as id, 
        label as label,
        primaryCategory.categoryName as categoryName,
        shippingInfo {
            shippingType,
            shipToLocation
        }
    }]
}
from finding

---

Also, user functions for controlling property values would be helpful as well. For example:

QUERY:

var formatCurrency = require('utils/formatting').formatCurrency; 

select {
    totalCount,
    searchResult.items as items[{
       formatCurrency(buyItNowPrice.$t, buyItNowPrice.currencyId) as buyItNowPrice
    }]
}
from finding