fix: handle 400 error with invalid id lengths

[kevinpagtakhan]

Summary

While testing the SDK, I tried sending an event with deviceId of 1 as number. The response as expected is a 400 error, but surprisingly with this payload:

{
  "code":400,
  "events_with_invalid_id_lengths":{
    "device_id":[0]
  },
  "error":"Invalid id length for user_id or device_id"
}

The field events_with_invalid_id_lengths is not documented in developer docs and was not initially handled.

The changes inspects the optional field of events_with_invalid_id_lengths and considers its contents to determine which events will be retried.

Checklist

• Does your PR title have the correct title format?
• Does your PR have a breaking change?: No