Serializable invdes postprocessing

[yaugenst-flex]

Is this roughly what you had in mind @tylerflex?

This is branched off of #1848
Closes #1943

[tylerflex]

Yea this is pretty much exactly what I had in mind.

[yaugenst-flex]

ok nice I'll fix the tests and wrap this up then

[tylerflex]

How would this work with InverseDesignMulti?

[yaugenst-flex]

yeah I have to check that. I think it might just work? will test

[tylerflex]

Each simulation will need its own post process function. So i guess maybe a list of them is needed. But seems kind of clunky at first glance.

[yaugenst-flex]

how does this currently work? doesn't the optimizer.run() take only a single fn?

[tylerflex]

It does but the function takes the batch data as arguments (i think, it might also take the individual simulation data's as args too). Check the last couple cells of the main tutorial Invdes.ipynb (on mobile)