Integration with MTK

[jpfairbanks]

@lukem12345, MTK is going to support the EC in their expressions. Once that exists, we should support Decapode -> MTK conversion.

[lukem12345]

Since the 0D, 1D, 2D cases of the exterior calculus are so similar to vector calculus, I wonder if translating such diagrams to the current MTK is feasible already. This might also give those folks an idea of what integration might look like as they are developing. i.e. Avoiding some waterfall-ing of integrating only after developing

[lukem12345]

Hyperlinking PR #233

[lukem12345]

@jpfairbanks Can we close this as not planned? It seems like integration going forward will be by exposing proper hooks such as PR #233 for tools like https://github.com/SciML/SciMLSensitivity.jl, rather than doing conversions at the MTK level?