Additional endpoint to increase monthly limit by email address or token

[aldy505]

Create a new endpoint on the registration module to increase a user's monthly limit. It searches by user's token or email address, with token being the first priority. If the token is null or an empty string, it will search by the email address. If both token and email address fields are empty, return an error of BadRequest.

Endpoint: PATCH /api/increase-limit

Request body:

{
  "email": "string", // can be empty string / nullable
  "token": "string", // can be empty string / nullable
  "new_limit": 100
}