[heycam/webidl] Add [InsecureContext] (#471)

To make it clear which (new) APIs are available on insecure contexts and encourage spec authors to make a conscious decision, I propose adding `[InsecureContext]` as a peer to `[SecureContext]`.

Such an attribute would also enable tools, such as Bikeshed and IDL compilers, to ensure that one or the other has been specified.

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