feat: change Lipschitz cst estimation to Jacobian method #95
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To estimate the Lipschitz constant of a model, we now use the Jacobian method that is more robust than random perturbations (subject to numerical errors).
The Jacobian method computes Jacobians for a batch of inputs and gets the max singular values of each Jacobian matrix, corresponding to the local Lipschitz constant. The function then returns the greatest Lipschitz constant estimation in the batch.