energies: adding energy loss functions #734
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This commit adds energy loss functions. These are loss functions analogous to those obtained from PDE equations or boundary equations, but the energy integrand can be given explicitly in symbolic form.
The energies are maintained in a separate field from the PDE equations so that they can be weighted differently in adaptive loss functions.
I am happy to extend the docs once the general direction of this PR is approved.
This PR depends on SciML/ModelingToolkit.jl#2256.