Add better failure responses

## Background
The lambda returns status code 500 on failure.

## Feature
The lambda should return detailed response on failure with `success: false` and array of `errors` (with the error message

## Example [Optional]
```json
{
  "success": false,
  "statusCode": 500,
  "errors": [
    { "type": "postgres", "message": "Connection failed to initialize" }
  ]
} 
```
