add lumigo-core library to the layer files

Author: saartochner-lumigo

scripts/prepare_layer_files.sh

@@ -5,3 +5,4 @@ python setup.py bdist_wheel
 rm -rf python && mkdir python
 cp -R src/lumigo_tracer.egg-info python/
 cp -R src/lumigo_tracer python/
+cp -R "$(python -c "import lumigo_core; print(lumigo_core.__path__[0])")"* python/