Kokkos exec space init should init Kokkos profiling

[mhoemmen]

Kokkos::initialize sets up Kokkos profiling. However, the execution spaces' initialize() functions do not. This means that if you call the execution spaces' initialize without calling Kokkos::initialize (as Tpetra does), you don't start Kokkos profiling. It would be reasonable for the execution spaces' initialize() and finalize() functions to start resp. stop Kokkos profiling.

@crtrott @aprokop