fr(material/icon): Support fetching icons with credentials

[jchv]

Feature Description

Right now it seems when you call addSvgIcon, the fetch is done without credentials. This is usually what you want, but unfortunately for cross-domain requests, it can also lead to a client cert being omitted in an environment where client certificates are required. In some cases, Chrome will send the client certificate anyways, but Firefox will not. See whatwg/fetch#869 and the Chromium issue for background.

Use Case

This would allow SVG icons to be fetched cross-domain in environments where security credentials are required.

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