Implement sparse kernel benchmarks (moderate level, independent, starter)

Bugzilla Link	52308
Version	unspecified
OS	Linux
CC	@joker-eph,@SaurabhJha

Extended Description

The sparse compiler relies on FileCheck based tests (https://github.com/llvm/llvm-project/tree/main/mlir/test/Dialect/SparseTensor) and "regression" test (https://github.com/llvm/llvm-project/tree/main/mlir/test/Integration/Dialect/SparseTensor/CPU). These tests make sure that the generated IR is as expected and that the lowering runs "end to end". Most of these tests were developed in conjunction with particular features while they were being added.

However, we don't have any benchmarks to measure the performance of the generated code (and make sure this performance does not regress by later changes to the sparse compiler).

The entry requests adding such benchmarks to MLIR, which requires (1) investigating the typical way in which LLVM at large integrates benchmarks (2) find interesting sparse kernels to implement and measure (3) integrate such tests in a continuous build (or at least frequently run system)

This can act as a good independent start (since it does not require intimate knowledge of the inner workings of MLIR's sparse compiler). The level is medium, however, since the engineering work is non-trivial.