[heycam/webidl] Add some kind of informative summary table of extended attributes (#287)

I'm thinking the three columns are: name, applies to, notes.

An example entry would be: [Constructor], interfaces, multiple can be specified; conflicts with [NoInterfaceObject]; cannot be specified on callback interfaces.

This should be done after #286 as that would change the table significantly.

This would help massively for answering questions like the ones that came up during #286 around "which extended attributes apply to operations" and such.

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