[w3c/clipboard-apis] Discoverability of custom type support (#30)

Some implementations support adding custom types on the clipboard, some do not. This is presumably a temporary state while implementations (and the spec) improve(s) - however, should there be a way to feature-detect whether custom types are supported?

Perhaps we should add ``ClipboardData.prototype.supportedTypes = ['text/plain', 'text/html', ... 'custom']`` - or something like that?

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