Expose Schur decomposition

[alexander-novo]

Right now, there is no exposed version of the Schur decomposition. There is functionality for calculating a schur decomposition which is used in calculating eigendecomposition, so it would be nice if these were exposed in a public API.

The schur decomposition is used in plenty of places where we need more than just the eigenvalues on the diagonal, such as in solving lyapunov equations AX + XA* = B, which come up in systems theory

[sarah-quinones]

it's planned. I'm just busy refactoring the code at the moment