* [GNA] Insert identity using ngraph transformation * Update src/plugins/intel_gna/src/ops/identity.hpp Co-authored-by: Szymon Irzabek <szymon.jakub.irzabek@intel.com> * Update src/plugins/intel_gna/src/transformations/rt_info/gna_precision_change_flag.hpp Co-authored-by: Szymon Irzabek <szymon.jakub.irzabek@intel.com> * Update src/plugins/intel_gna/src/transformations/rt_info/gna_precision_change_flag.cpp Co-authored-by: Szymon Irzabek <szymon.jakub.irzabek@intel.com> * Update src/plugins/intel_gna/src/transformations/insert_identity_layer.hpp Co-authored-by: Szymon Irzabek <szymon.jakub.irzabek@intel.com> * Rewrites pass with Identity insertion using recusrive function. Adds test for Split. Adds comments * Change namespace for element type Co-authored-by: Szymon Irzabek <szymon.jakub.irzabek@intel.com>