[Code gen trafo] Restructured test and function to fit the transformation into finn transformation layout

[Code gen trafo] Added draft of code_gen_transformation -> needs more testing case to check functionality

[Test] Changed test layer to streaming fc layer; [Recaftoring] Changed generating weights an thresholds

[Test] Added helper function to prepare the input data for execute_onnx and changed the way bipolar values are handled in single fclayer modelwrapper