Config: account templates mapping_list_ranges across firms

[AgustinSilverfin]

Describe the bug Mapping List ranges are currently stored as follows:

  "mapping_list_ranges": [
    {
      "account_mapping_list_id": 458,
      "account_range": "4__7"
    },
    {
      "account_mapping_list_id": 459,
      "account_range": "4__7"
    }
  ],

But, the mapping list id is dependent on the firm, so using the same template in another firm will raise error if the mapping list id doesn't exist (which it won't exist, it will have a different id)

• We need to store this in a way that can be used across different firms, maybe:

  "mapping_list_ranges": { 
  "123": [
  {
    "account_mapping_list_id": 458,
    "account_range": "4__7"
  },
  {
    "account_mapping_list_id": 459,
    "account_range": "4__7"
  }
  ],
  "1000": [...]
  }

• We should also consider partner firms there.
• We should also look into a way of identifying if it's the same mapping list across firms.

Edit: also consider this comment related to mapping list and partners api

[Woetfin]

Should be resolved by #86