[mlir][sparse] introduce sparse_tensor.iterate operation (#88807)

A `sparse_tensor.iterate` iterates over a sparse iteration space
extracted from `sparse_tensor.extract_iteration_space` operation
introduced in https://github.com/llvm/llvm-project/pull/88554.

*DO NOT MERGE* before https://github.com/llvm/llvm-project/pull/88554

GitOrigin-RevId: 8debcf03c535e14ee47b14fddfcaeae3f32d1317
8 files changed
tree: d7e5c1fec5a2be4c61d71c53e3ece27d3b58516f
  1. benchmark/
  2. cmake/
  3. docs/
  4. examples/
  5. include/
  6. lib/
  7. python/
  8. test/
  9. tools/
  10. unittests/
  11. utils/
  12. .clang-format
  13. .clang-tidy
  14. CMakeLists.txt
  15. LICENSE.TXT
  16. README.md
README.md

Multi-Level Intermediate Representation

See https://mlir.llvm.org/ for more information.