Display monthly product consumption

Create a list of all the products purchased per month and the amount that has being purchased of each product. This should be a new page available to every member in the Almacen menu.

We can use /api/transaction?type=purchase and aggregate them in the javascript side, this call returns a json list like:

[
  {
    "ID": 42,
    "member": {
      "num": 900,
      "login": "admin",
      "name": "Administradora"
    },
    "date": "2021-03-22T12:55:35.753991252+01:00",
    "total": -1129,
    "type": "purchase",
    "purchase": [
      {
        "code": 135,
        "product": {
          "code": 135,
          "name": "tomates",
          "price": 1129,
          "stock": 20
        },
        "price": 1129,
        "amount": 1
      }
    ]
  },
  {
    "ID": 39,
    "member": {
      "num": 900,
      "login": "admin",
      "name": "Administradora"
    },
    "date": "2021-03-16T22:14:10.210364833+01:00",
    "total": -1243,
    "type": "purchase",
    "purchase": [
      {
        "code": 135,
        "product": {
          "code": 135,
          "name": "tomates"
        },
        "price": 1129,
        "amount": 1
      },
      {
        "code": 112,
        "product": {
          "code": 112,
          "name": "arroz"
        },
        "price": 114,
        "amount": 1
      }
    ]
  }
]

Prices are in cents, so 114 means 1.14 euros. See that there is a conversion function in src/util.js.