Query 1: Get the entire menu
Request Format: mowgliscafe.php?menu=all
Request Type: GET
        Returned Data Format: JSON
        Description: Returns returns a detailed JSON object containing data for the entire menu for the cafe.
Request: https://courses.cs.washington.edu/courses/cse154/webservices/mowgliscafe/mowgliscafe.php?menu=all
Output: (abbreviated)
{
  "Drinks" : [
    {
      "category" : "Coffee",
      "items" : [
        {
          "name" : "Brewed Coffee (Black)",
          "price" : "1.25",
          "cost" : "0.65"
        },
        {
          "name" : "Brewed Coffee (With Cream)",
          "price" : "1.50",
          "cost" : "0.85"
        },
       ...
      ]
    },
    ...
  ],
  "Bakery" : [
    {
      "category" : "Scones",
      "items" : [
        {
          "name" : "Blueberry Scone",
          "price" : "3.50",
          "cost" : "0.75"
        },
        ...
       ]
    },
    ...
  ]
}
        The values of the returned JSON object include a list of subcategories of that category. Each subcategory of the category (like "Coffee" in "Drinks") has a list of "items". Each item has a "name", "price" and "cost" associated with it.