Computes the nullspace of a matrix A.

::

 nullspace(DM A) -> DM
 nullspace(SX A) -> SX
 nullspace(MX A) -> MX

Finds Z m-by-(m-n) such that AZ = 0 with A n-by-m with m > n

Assumes A is full rank

Inspired by Numerical Methods in Scientific Computing by Ake Bjorck

Extra doc: https://github.com/casadi/casadi/wiki/L_1cb

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/generic_matrix.hpp#L579

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/generic_matrix.hpp#L579-L581

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