Enable or disable profiling

[gdgirard]

Wrapp theses lines appearing in all main programs:

// Environments variables for profiling
setenv("KOKKOS_TOOLS_LIBS", KP_KERNEL_TIMER_PATH, false);
setenv("KOKKOS_TOOLS_TIMER_JSON", "true", false);

in a proper tool that enables or disables this profiling by using an environment variable (such as GYSELAX_ENABLE_TELEMETRY=kktimer) as proposed by Etienne.