[Serving] PaddleSeg add triton serving && simple serving example (#1171)

* Update keypointdetection result docs

* Update im.copy() to im in examples

* Update new Api, fastdeploy::vision::Visualize to fastdeploy::vision

* Update SwapBackgroundSegmentation && SwapBackgroundMatting to SwapBackground

* Update README_CN.md

* Update README_CN.md

* Update preprocessor.h

* PaddleSeg supports triton serving

* Add PaddleSeg simple serving example

* Add PaddleSeg triton serving client code

* Update triton serving runtime config.pbtxt

* Update paddleseg grpc client

* Add paddle serving README

examples/vision/segmentation/paddleseg/python/serving/client.py

@@ -0,0 +1,23 @@
+import requests
+import json
+import cv2
+import fastdeploy as fd
+from fastdeploy.serving.utils import cv2_to_base64
+
+if __name__ == '__main__':
+    url = "http://127.0.0.1:8000/fd/ppliteseg"
+    headers = {"Content-Type": "application/json"}
+
+    im = cv2.imread("cityscapes_demo.png")
+    data = {"data": {"image": cv2_to_base64(im)}, "parameters": {}}
+
+    resp = requests.post(url=url, headers=headers, data=json.dumps(data))
+    if resp.status_code == 200:
+        r_json = json.loads(resp.json()["result"])
+        result = fd.vision.utils.json_to_segmentation(r_json)
+        vis_im = fd.vision.vis_segmentation(im, result, weight=0.5)
+        cv2.imwrite("visualized_result.jpg", vis_im)
+        print("Visualized result save in ./visualized_result.jpg")
+    else:
+        print("Error code:", resp.status_code)
+        print(resp.text)