Redirect to storage object content

Convenience 302 redirect to a short-lived signed object URL for browser consumers. The `/url` sibling returns the same URL as JSON without redirecting.

curl -X GET "https://loading/api/v1/storage-objects/497f6eca-6276-4993-bfeb-53cbbbba6f08/content"

{
  "error": "string"
}

{
  "error": "string"
}

{
  "error": "string"
}

{
  "error": "string"
}