[heycam/webidl] Consider requiring optional dictionary defaulting explicitly (#602)

Instead of
```webidl
foo(optional dictionaryType arg);
```
perhaps we should require writing
```webidl
foo(optional dictionaryType arg = {});
```
for consistency with other optional arguments and for clarity for the reader. At least anecdotally this seems to be one of the most confusing things about IDL that's not a legacy feature.

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