[heycam/webidl] Serializable types should include unrestricted double and unrestricted float (#370)

Currently, the list of serializable types (https://heycam.github.io/webidl/#dfn-serializable-type) does not include **unrestricted double** and **unrestricted float**.  Specs are relying on them being serializable (see https://drafts.fxtf.org/geometry-1/#dompointreadonly for an example), so it would probably make sense to add.

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https://github.com/heycam/webidl/issues/370