Dlejeune/ck tile 2d multiple reductions (#3147)

* WIP

* Add Unit tests for the Multi Reduction Kernel

* clang format

* Rename multiblock to threadwise

* Multiblock WIP

* Fix multi reduce multi block unit tests

* Multi Reduce Tile Engine: WIP

* refactoring + try addressing precision error

* Fix multiops examples

* Cleanup

* Clean up tile engine's reduce op

* Update changelog

* Fix remod/clang

* Fix dates

* Fix documentation & missing file

* Fix comments

* Use the update_tile api in the multi-block kernel

* Unify threadwise/multiblock into a single kernel + default multiblock output to float in tests

* Add TileParitioner

* Cleanup

* Add warning when no data to process, in the example

* Refactoring Reduce kernel Tile Partioner + cleanup

* Move the tile partioner to its own file

* Add missing includes

* Fix copyright header with update_amd_copyright_headers.py

* Fix change of interface in Reduce2dProblem

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Co-authored-by: Damien Lejeune <damien.lejeune@amd.com>
Co-authored-by: Adam Osewski <19374865+aosewski@users.noreply.github.com>