* [ONNX FE] Support value freezing without specifying type Implement gete_element_type method for ONNX InputModel. Implement tests with freezing integer input and float models Signed-off-by: Kazantsev, Roman <roman.kazantsev@intel.com> * Update src/frontends/onnx/frontend/src/input_model.cpp Co-authored-by: Tomasz Dołbniak <tomasz.dolbniak@intel.com> * Update src/frontends/onnx/frontend/src/input_model.cpp Co-authored-by: Tomasz Dołbniak <tomasz.dolbniak@intel.com> * Update src/frontends/onnx/frontend/src/input_model.cpp Co-authored-by: Katarzyna Mitrus <katarzyna.mitrus@intel.com> * Return only element type for model inputs and add ONNX FE tests * Rename variable in the test * Add syntax mark Signed-off-by: Kazantsev, Roman <roman.kazantsev@intel.com> Co-authored-by: Tomasz Dołbniak <tomasz.dolbniak@intel.com> Co-authored-by: Katarzyna Mitrus <katarzyna.mitrus@intel.com> Signed-off-by: Kazantsev, Roman <roman.kazantsev@intel.com> Co-authored-by: Tomasz Dołbniak <tomasz.dolbniak@intel.com> Co-authored-by: Katarzyna Mitrus <katarzyna.mitrus@intel.com>