URLs with e.g. `data:` or `mailto:` scheme get `///` injected

[jrauh01]

Describe the bug

If data:image/png is passed to Url::fromPath(), getAbsoluteUrl() returns data:///image/png.

To Reproduce

var_dump(Url::fromPath('data:image/png')->getAbsoluteUrl());

Problem

The scheme does automatically appended with ://. Additionally the base url, that is / is inserted.

Expected behavior

If data:image/png is passed to Url::fromPath(), getAbsoluteUrl() should return data:image/png instead of data:///image/png.

Additional context

Because ipl\Web\Widget\Link calls Url::fromPath() to create a URL object which calls $this->getAbsoulteUrl() in __toString() method, this causes problems e.g. when creating a download link. Browsers like chrome and firefox don't care about that, but safari does not trigger a download if the URL contains ///.