Support filename* parameter for Content-Disposition header of file upload

Problem/Motivation

I would like to upload files with UTF-8 characters in the filename using jsonapi. I expected to be able to do this by using a filename*=UTF-8'' parameter in the Content-Disposition header, but found that it's not supported yet.

Steps to reproduce

Upload a file for an entity field using jsonapi with filename* in the Content-Disposition header. Example headers:

{
          'Accept': 'application/vnd.api+json',
          'Content-Type': 'application/octet-stream',
          'Content-Disposition': 'file; filename="example.txt"; filename*=UTF-8\'\'ex%C3%A4mple.txt'
}

The filename* parameter is ignored and the file will be named example.txt instead of exämple.txt. Removing the filename parameter throws an error because it is required.

Proposed resolution

Support and give preference to the filename* parameter as described at https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Dispos...