[WIP] Add Branson Monte Carlo Kernel

[michaelmckinsey1]

Summary

An intern (@RanivG) will be implementing https://github.com/lanl/branson/blob/3f538e31a51b144b6621d4665f465d8d44ee85b8/src/event_based_transport.h#L323 as a kernel in RAJAPerf.

• This PR is a new kernel.

• It does the following (modify list as needed):

  • Adds Apps_TRANSPORT_3DMC kernel

• Add reference implementation to header file (see other kernels for examples).

• Rename to MC_EVENT_PHOTON_TRANSPORT

[MrBurmark]

Is there a better name for this kernel?

[michaelmckinsey1]

Is there a better name for this kernel?

I am open to suggestions, but it can be renamed easily.

[rhornung67]

I'm fine with the name. @MrBurmark do you have a specific concern about the name?

[MrBurmark]

The name is just very generic. Is the kernel any specific part of the Monty Carlo algorithm?

[rhornung67]

The name is just very generic. Is the kernel any specific part of the Monty Carlo algorithm?

That's a good point. A brief scan of the code at the link @michaelmckinsey1 provided above to the Branson code, perhaps something like MC_EVENT_PHOTON_TRANSPORT, if that's not too long.

[rhornung67]

@michaelmckinsey1 please add a reference implementation to the kernel header file.