[Model] add PFLD model (#433)

* support face alignment PFLD

* add PFLD demo

* fixed FaceAlignmentResult

* fixed bugs

* fixed img size

* fixed readme

* deal with comments

* fixed readme

* add pfld testcase

* update infer.py

* add gflags for example

* update c++ readme

* add gflags in example

* fixed for ci

* fixed gflags.cmake

* deal with comments

* update infer demo

Co-authored-by: Jason <jiangjiajun@baidu.com>

fastdeploy/vision/facealign/contrib/pfld_pybind.cc

@@ -0,0 +1,31 @@
+// 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 BindPFLD(pybind11::module& m) {
+  pybind11::class_<vision::facealign::PFLD, FastDeployModel>(m, "PFLD")
+      .def(pybind11::init<std::string, std::string, RuntimeOption,
+                          ModelFormat>())
+      .def("predict",
+           [](vision::facealign::PFLD& self, pybind11::array& data) {
+             auto mat = PyArrayToCvMat(data);
+             vision::FaceAlignmentResult res;
+             self.Predict(&mat, &res);
+             return res;
+           })
+      .def_readwrite("size", &vision::facealign::PFLD::size);
+}
+}  // namespace fastdeploy