Implement MinMax algebra rewrites to simplify slice shape graphs

Author: ricardoV94

Diff for: pytensor/tensor/rewriting/__init__.py

@@ -6,6 +6,7 @@
 import pytensor.tensor.rewriting.einsum
 import pytensor.tensor.rewriting.elemwise
 import pytensor.tensor.rewriting.extra_ops
+import pytensor.tensor.rewriting.extremum
 import pytensor.tensor.rewriting.jax
 import pytensor.tensor.rewriting.linalg
 import pytensor.tensor.rewriting.math