Provide a URL-only option in the download link formatter

Going to fix this issue. I found that DownloadLinkFieldFormatter extends LinkFormatter, so options must be available by default. Just need to update plugin base methods.

Refactored FieldFromatter a bit, fixed problem with missing options and coding standards issues.

I verified the PR and tested it for Problem defined in the issue. Looks great.

All works as expected. Coding standards also looks good. I have ran rector and no errors reported.

Moving this to RTBC.

Thanks!