Add kokkos device-side rng

[jjaraalm]

Adds a checkpointed and restored Kokkos::Random_XorShift64_Pool to rng_pool_t for device-side rng.

Right now, this isn't used elsewhere in the codebase, but I need it for more easily porting and accelerating custom code.

[jjaraalm]

This also needs to update the compile script to include the kokkos algorithms kokkos/algorithms/src, but I don't really understand the cmake logic generating the script. For now, I've been adding the include location by hand.