Allow developers to access the Order resource

[AdamSheaffer]

Implement the following endpoints

Description	Endpoint	Method	Request Body	Response Body
Get orders made by customer	api/orders?customerId={customer Id}	GET		Order Array
Get order by order ID	api/orders/{id}	GET		Order Object
Get customer's shopping cart	api/orders?customerId={customerId}&cart=true	GET		Order Object w/ Product Array
Add a product to shopping cart	api/orders	POST	CustomerProduct Object	Order Object
Purchase order in cart**	api/orders/{id}	PUT	Order Object**
Remove product from cart	api/orders/{orderId}/products{productId}	DELETE

* Order objects that have a payment method that isn't NULL are considered complete and processed. An order that does not have a payment type would be considered a user's shopping cart. A user can have only one shopping cart, and therefore will only have a maximum of one Order record in the database with a NULL payment type at a given time.

** To purchase an order, update the Order object's userPaymentId property

JSON Order Object

{
    "id": 1575559407665,
    "customerId": 1575559407787,
    "userPaymentId": null
}

JSON CustomerProduct Object

{
    "customerId": 1575559407787,
    "productId": 1575501970208
}