[PATCH] EB-124910 Adding pointer to extra key error dictionary field

[lautaro-eb]

Adding pointer to extra key error dictionary field.
This will prevent not clear messages, for instance at the API level.

Needed Request Schema

{
    "performer": {
        "artist_id": 2
    }
}

Realized request

{
    "performer": {
        "artist_id": 2,
        "not_known_field": 12
    }
}

Response

{
    "status_code": 400,
    "error_description": "There are errors with your arguments: performer - UNKNOWN",
    "error": "ARGUMENTS_ERROR"
}

Expected response

{
    "status_code": 400,
    "error_description": "There are errors with your arguments: performer.not_known_field - UNKNOWN",
    "error": "ARGUMENTS_ERROR"
}

[nickwilliams-eventbrite]

Putting a temporary hold on this while we discuss on Slack.

[vartec]

This is backwards incompatible change, and as such should be considered [MAJOR]