[whatwg/fetch] investigate data: URL quoted parameters (#970)

Currently the [`data:` URL processor](https://fetch.spec.whatwg.org/#data-url-processor) splits the MIME from the body on the first `,`. However, MIME parameters, [do parse](https://mimesniff.spec.whatwg.org/#parsing-a-mime-type) `,` within parameter values. While it a collision would continue to exist for unquoted parameters that is unlikely to be fixed, investigation into if supporting quoted parameters with `,` within their values is potentially useful.

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