Remove chi2, schi2 from history about pypesto HOT 4 OPEN

grad (and potentially also fval) won't be computed when using least squares optimizers, so they can't be stored in history.

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after looking at #902, I realized there already are multiple conversion functions, so I would agree that these fields are no longer necessary.

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these are 1-1 to fval, grad,

Ideally 😅

waste of storage

At least for HDF5, when enabling compression, this shouldn't be a big deal

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grad (and potentially also fval) won't be computed when using least squares optimizers, so they can't be stored in history.

In

fval, grad, hess etc are computed from res, sres if applicable. This function is always called before storing stuff to history, so these values should then be available in history.

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