Burgers 1D Models TODO

[vpuri3]

• reduce models to simple test-cases with (nsims=2) and test on CPU till DiffEqBase.UNITLESS_ABS2 failing on GPU componentarrays SciML/ComponentArrays.jl#155 type bugs are sorted
• verify that encapsulating SciMLOperators update calls in Zygote.ignore() doesn't affect gradient https://github.com/vpuri3/PDEInterfaces.jl/blob/ceb3ab1529cb5f3c30258ae2da5d4b968d6ef97c/examples/burgers/model0.jl#L77-L86
• eventually have Zygote play nice with A(u,p,t) since none of the inputs are modified in the update.