[IMPLEMENTED] Local hosted S3 API

Hi.

I was configuring squidex to use the the AmazonS3 object store and found that there is no way to integrate it with locally hosted amazon s3 compatible services like the minio. Is there any way to do that, as I understand from sources right now it is getting service URL from region, but Amazon S3 SDK allows to pass custom service url.
And if there is no way to do that right now, is there plans to allow this kind of configuration?

Thanks.

Merged your PR, thx a lot