#22760 added support for __matmul__ in the coercion model.

We should start using it.

First step: Review the semantics of this operator in major Python software for matrix and tensor computation (NumPy, Numba, TensorFlow, PyTorch, ...) so that we do not paint ourselves into a corner.

Follow-up tickets:

• sage.geometry.hyperbolic_space: __matmul__ for composition of isometries #32212 sage.geometry.hyperbolic_space

CC: @tscrim @egourgoulhon

Component: linear algebra

Author: Matthias Koeppe

Branch/Commit: u/mkoeppe/use__matmul__operator____ @ da5104c

Issue created by migration from https://trac.sagemath.org/ticket/30244