Move subtensor lift rewrites to their own module

Author: ricardoV94

pytensor/tensor/rewriting/__init__.py

@@ -15,4 +15,5 @@
 import pytensor.tensor.rewriting.shape
 import pytensor.tensor.rewriting.special
 import pytensor.tensor.rewriting.subtensor
+import pytensor.tensor.rewriting.subtensor_lift
 import pytensor.tensor.rewriting.uncanonicalize