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Enable retrieving the code object to do tuning in the future.

* Remove unused headers

Updated each source file in the repo with the existing license.

Remove std references in runtime compilation since these are not available when using hiprtc and the headers may not be available on the system

This adds the infrastructure so we can compile everything in parallel, whereas before only pointwise kernels were compiled in parallel. This will also directly integrate with lowering and the gpu-driver. The kernels for pointwise and roialign are using this infrastructure. Scatternd is not since it does require standard shape.

This also makes it easier to add new runtime compiled kernels in the future.