Add direct JuMP integration bypassing expensive initialize #3
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This PR adds an optimize hook that directly replaces JuMP's AD system.
It's currently a little wasteful in that it goes JuMP -> Expr -> _Function. Now that it's working, I'll try and skip the intermediary Expr step.It's actually useful because it allows us to expand subexpressions first.I haven't attempted to incorporate user-defined functions yet.