Add product catalog with tariffs endpoint

CHANGELOG:

### Added
- [#518](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/518) Add `product-catalog` endpoint to our API to check the product catalog with their prices, according to different taxes.

---

curl -XGET -H 'Api-Key: xxxx' http://odoo-sc.local:8069/api/product-catalog?code=0IVA | jq -r '.'
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  3496  100  3496    0     0  13656      0 --:--:-- --:--:-- --:--:-- 13709

{
  "pricelists": [
    {
      "code": "0IVA",
      "products": [
        {
          "code": "SE_SC_REC_BA_F_600",
          "name": "Fibra 600Mb",
          "price": 35.54,
          "category": "fiber",
          "minutes": null,
          "data": null,
          "bandwidth": 600,
          "available_for": [
            "member"
          ]
        },
        {
          "code": "SE_SC_REC_MOBILE_T_0_0",
          "name": "0 min 0 MB",
          "price": 1.6500000000000001,
          "category": "mobile",
          "minutes": 0,
          "data": 0,
          "bandwidth": null,
          "available_for": [
            "member",
            "coop_agreement",
            "sponsored"
          ]
        },
        {
          "code": "SE_SC_REC_MOBILE_T_0_1024",
          "name": "0 min 1 GB",
          "price": 3.72,
          "category": "mobile",
          "minutes": 0,
          "data": 1024,
          "bandwidth": null,
          "available_for": [
            "member",
            "coop_agreement",
            "sponsored"
          ]
        },
        ...
    },
    ...
  ]
}