Added kokkos datatypes to FixRxKokkos::computeLocalTemperature(...)

Added kokkos dual-view datatypes used in computeLocalTemperature and
pre_force (e.g., dpdThetaLocal) but still using the original host
pointers for the pack/unpack operations.

TODO:

• The Kokkos neighbor list is not working. Need to request a Kokkos neighbor list in ::init(). Then, replace objects like list->ilist[] with k_list->d_ilist().
• Add another template parameter for HALFTHREAD and create (automatic) atomic view of dpdThetaLocal and sumWeights.
• Add modify/sync comments and replace the host-only pointers in the pack/unpack methods.