* add space_filling_curve
* cleanup and move space_filling_curve into test
* WIP: start refactoring threadwise_transfer_v1r3
* threadwise_copy works but needs further refactoring
* add some comments
* add SpaceFillingCurve::GetIndices()
* minor changes
* removed GetIndices; refactored GetDstCoordinateResetStep
* add DynamicBuffer::Transfer, but Add is not tested
* rebased agaist develop
* threadwise_copy_v6r1/v6r2/v6r3 using space-filling curve start to work
* minor changes
* refactored threadcopy v3r1, v2; removed old implementations
* clang-format
* cleanup
* fix a typo in v6r3
* format
Co-authored-by: Chao Liu <chao.liu2@amd.com>
* add space_filling_curve
* cleanup and move space_filling_curve into test
* add functions for backward and forward step; hard coded results in unit test
* minor changes
