[whatwg/url] Implement URL.from helper (#443)

Hello, everyone!
 
I've implemented `URL.from` over in Node.js project ([PR](https://github.com/nodejs/node/pull/28482)), but we have a discussion there on to should we extend `URL` object or not. Good points are made for not doing so.

However, it feels like it would be convenient to have an option of creating a url object not only from string that should represent a url, but also from an object (or any other alternative according to any language) allowing builder pattern.Also it can be much faster than parsing the string.

I guess it would be a nice option in the browsers as well since making a url from an object-config is as common as making a url from string. 

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