Architecture Extensions for Adding (Topology) Optimization

[QuentinWach]

Implementing topology optimization via the adjoint method is simple in principle but the current API which is split into two distinct stages makes it somewhat awkward. For example, we would have to re-rasterize the domain after every time that we modify the design. So at the very least, we should likely need to modify the FDTD module so it can directly use a RegularGrid as input rather than just a parametric Design object which it then rasterized internally.

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch new_topo

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