Calculate  Matrix exponential.

::

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

Extra doc: https://github.com/casadi/casadi/wiki/L_23w

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/generic_matrix.hpp#L790

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/generic_matrix.hpp#L790-L792

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