Modify file structure to separate python and cpp code (#223)

Modify code structure

fastdeploy/vision/segmentation/segmentation_pybind.cc

@@ -0,0 +1,26 @@
+// Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "fastdeploy/pybind/main.h"
+
+namespace fastdeploy {
+
+void BindPPSeg(pybind11::module& m);
+
+void BindSegmentation(pybind11::module& m) {
+  auto segmentation_module =
+      m.def_submodule("segmentation", "Image semantic segmentation models.");
+  BindPPSeg(segmentation_module);
+}
+}  // namespace fastdeploy