Remove main.cpp generation from export_scheduler

fix #197 (closed)

aidge_core/export_utils/__init__.py

@@ -3,4 +3,4 @@ from .code_generation import generate_file, generate_str, copy_file
 from .export_registry import ExportLib
 from .scheduler_export import scheduler_export
 from .tensor_export import tensor_to_c, generate_input_file
-
+from .generate_main import generate_main_cpp