API to get user stats

[gjermundgaraba]

Create a new service to get user stats (i.e. new folder on the root of this project called "stats")

• Create the new service with the new API
• Write the tests

Return:

• Number of available (unused) vouchers
• Number of used vouchers
• Array of types of materials the user has deposited (aggregated)

Example:

{
  "numberOfAvailableVouchers": 3,
  "numberOfUsedVouchers": 42,
  "depositAmounts": [
    {
      "materialDefinition": {
        "plasticType": "PET"
      },
      "magnitude": 0, // 0 = Weight, 1 = Count. See commons/models.go
      "amount": 1.2
    },
    {
      "materialDefinition": {
        "plasticType": "HDPE"
      },
      "magnitude": 0, // 0 = Weight, 1 = Count. See commons/models.go
      "amount": 13.37
    },
    {
      "materialDefinition": {
        "plasticType": "Snus"
      },
      "magnitude": 1, // 0 = Weight, 1 = Count. See commons/models.go
      "amount": 314
    }
  ]
}

To see more details on the definition of the deposit amount model, look at https://github.com/empowerchain/deposit-backend/blob/main/commons/models.go

When you are done the file structure of the repo would probably look something like this:

- admin/ [+]
- commons/ [+]
- deposit/ [+]
- organization/ [+]
- scheme/ [+]
- stats/ [-]
  - stats.go
  - stats_test.go
- tmp/ [+]
...