API - Accounts added as concept

✨ Improvements

We are introducing the concept of "accounts" in place of "organizations" and "user groups" to make it simpler for clients to access our data.

As part of this update, a new endpoint is added for users to get their accounts information. The payload contains account ID and name:

GET /accounts

{
  "id": "95cf8d10-fd0d-47c4-bb48-11c01e36060e",
  "name": "An account"
}