Converts a path string to a file URL.

import { toFileUrl } from "https://deno.land/std@0.224.0/path/to_file_url.ts";

// posix
toFileUrl("/home/foo"); // new URL("file:///home/foo")

// win32
toFileUrl("\\home\\foo"); // new URL("file:///home/foo")
toFileUrl("C:\\Users\\foo"); // new URL("file:///C:/Users/foo")
toFileUrl("\\\\127.0.0.1\\home\\foo"); // new URL("file://127.0.0.1/home/foo")