Forward declare nng_socket and nng_dialer, changing them into pointers and propagating this change to not expose nng.h in tt_simulation_host.hpp
remove create_flatbuffer and print_flatbuffer as a member function in tt_simulation_device so now no need to expose flatbuffers in tt_simulation_device.hpp
Issue: https://github.com/tenstorrent/tt-umd/issues/187
Changes include:
nng_socketandnng_dialer, changing them into pointers and propagating this change to not exposenng.hintt_simulation_host.hppcreate_flatbufferandprint_flatbufferas a member function intt_simulation_deviceso now no need to expose flatbuffers intt_simulation_device.hpp