[mlir][sparse][python] add an "exhaustive" sparse test using python

Using the python API to easily set up sparse kernels, this test
exhaustively builds, compilers, and runs SpMM for all annotations
on a sparse tensor, making sure every version generates the correct
result. This test also illustrates using the python API to set up
a sparse kernel and sparse compilation.

Reviewed By: bixia

Differential Revision: https://reviews.llvm.org/D107943