Minio support

[playaz44]

Feature Request

Hello, I come with a proposal to integrate Minio S3 to FoF/upload.
I found a ready code but I'm new in the flarum and I do not know how to do this.

https://github.com/passionbytes/cookbook/blob/master/docs/how-to-use-minio-as-laravel-file-storage.md

This will probably solve a few issues which I found by reading open issues.