Create a developer

curl --request POST \
  --url http://localhost:8080/api/v1/developers \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "username": "<string>",
  "github_user_id": 123,
  "onboarded_ts": "2023-11-07T05:31:56Z"
}
'

{
  "yapcoder_id": 123,
  "github_user_id": 123,
  "username": "<string>",
  "is_yapcoder": true,
  "onboarded_ts": "2023-11-07T05:31:56Z"
}