[heycam/webidl] Allow `object` for attribute names? (#845)

@gkellogg authoring JSON-LD 1.1 [wants to use `object` as a valid attribute name](https://github.com/w3c/respec/issues/2767). Obviously `_object` should work, but then `object` looks general enough for people to want using it without preceding underscore.

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https://github.com/heycam/webidl/issues/845