Benchmark `gensim` against AlgebraicPetri.jl's `vectorfield`

AlgebraicPetri also compiles ACSets down to functions that can be passed to the `ODEProblem` interface. Petri nets are equivalent to ordinary differential equations that we can write directly as Decapodes.

So, we should write a Petri net's equtions outright (e.g. SIR) as a Decapode and compare the results to a native AlgebraicPetri implementation.

Note that this is a separate issue from converting a Petri net ACSet to a Decapode ACSet, or adding back the old support for spatialized reaction diffusion systems for AlgebraicPetri that was dropped a while ago.