[mlir][Python] Add checking process before create an AffineMap from a permutation.

An invalid permutation will trigger a C++ assertion when attempting to create an AffineMap from the permutation.
This patch adds an `isPermutation` function to check the given permutation before creating the AffineMap.

Reviewed By: mehdi_amini

Differential Revision: https://reviews.llvm.org/D94492