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I didnt think we were getting a ton of benefit from the
AttributeStatement abstraction so I replaced it with IndexMap which
the attribute statement impl were using internally.
While the DOT language docs (https://graphviz.org/doc/info/lang.html) do
call out attr_stmt as part of the language definition the overhead of
the related traits, impl, structs, etc felt a bit heavy. In particular,
supporting the ability to create them as part of a build as well as
allowing users to add to them via other bulid fns was a bit awkward.
For now I think removing the abstraction makes sense and provides for a
simpler implementation. Can revisit this down the road if other
requirements come up that perhaps warrant the addittional code.
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