Optionally Return Full Response from Direct Uploads Endpoint

[jdalt]

Feature

This PR allows a library user to return the entire response from /rails/active_storage/direct_uploads in the DirectUploaderProvider onSuccess callback when fullAttributes flag is set on the DirectUploadProvider.

Example

<DirectUploadProvider
  ...
  fullAttributes={ true }
  onSuccess={(signedFiles) => {
    console.log(signedFiles)
  }}
  ...
/>     

will log out the full payload returned by the rails active storage endpoint as:

[
  {
    id: 183,
    key: "L3kN4RRdsCFFQuiDwd82J39Z",
    filename: "DJI_0058.JPG",
    content_type: "image/jpeg",
    metadata: {}, 
    signed_id: "eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBBYmM9IiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--f33fda912f4b4baa72c405efb385352dcf11ad92"
  }
]

Rationale

I understand that often times the signedId is all you need to make an attachment. It is sufficient for most cases. However when multiple files are uploaded, the exact file plus other data data is often needed to create or update records. In this case knowing which particular file the resulting AS upload result refers to is impossible with just the signedId and extra contextual information is necessary. By returning the entire payload of the newly created ActiveStorage::Blob record, the library user can tie the upload results to specific files.

Obviously this is only an issue when multiple files are uploaded and the attachments are not being made all to the same object, but that happens to just the problem I personally have ;).