Emit valid bad rows for size violation and generic error

[dilyand]

The stream collector can generate two types of bad rows: size violations and generic errors (when dealing with an illegal querystring).

Currently, it is only writing out the data component of the bad row, which makes the record an invalid self-describing JSON.

Example:

{
  "processor": {
    "artifact": "snowplow-stream-collector",
    "version": "2.1.0"
  },
  "failure": {
    "timestamp": "2021-01-28T12:44:08.953Z",
    "errors": [
      "IllegalQueryString"
    ]
  },
  "payload": ""
}

should be:

{
  "schema": "iglu:com.snowplowanalytics.snowplow.badrows/generic_error/jsonschema/1-0-0",
  "data": {
    "processor": {
      "artifact": "snowplow-stream-collector",
      "version": "2.1.0"
    },
    "failure": {
      "timestamp": "2021-01-28T12:44:08.953Z",
      "errors": [
        "IllegalQueryString"
      ]
    },
    "payload": ""
  }
}