Format submission summary

[leoraba]

Summary

This PR updates the response format for the data and errors fields in the following submission summary endpoints:

• GET /submission/{submissionId}
• GET /submission/category/{categoryId}

New Responses

• data and errors fields on a submission summary response.
  Example:

...
"data": {
  "participant": {
    "deletes": 0,
    "inserts": 20,
    "updates": 0
  }
},
"errors": {
  "participant": {
    "deletes": 0,
    "inserts": 20,
    "updates": 0
  }
},
...