Function getSubpath

Get the relative path to url from baseUrl, only if url is a subpath to baseUrl.

Example:

const url = new URL('http://a.com/basePath/images/cover.jpg');
const baseUrl = new URL('http://a.com/basePath/');
const subpath = URLUtils.getSubpath(url, baseUrl);

// subpath is: 'images/cover.jpg'
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