cumulative sum

::

 cumsum(DM A, int axis) -> DM
 cumsum(SX A, int axis) -> SX
 cumsum(MX A, int axis) -> MX

Extra doc: https://github.com/casadi/casadi/wiki/L_1lm

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/casadi_misc.hpp#L864

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/casadi_misc.hpp#L864-L872

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