[Serving] Simple serving YOLOv5 and PP-OCRv3 example, add uvicorn to fastdeploy tools (#986)

* ppocrv3 simple serving

* add uvicorn to fd tools

* update ppdet simple serving readme

* yolov5 simple serving

* not import simple serving by default

* remove config from envs

* update comment

examples/vision/detection/paddledetection/python/serving/server.py

@@ -1,18 +1,16 @@
 import fastdeploy as fd
+from fastdeploy.serving.server import SimpleServer
 import os
 import logging
 
 logging.getLogger().setLevel(logging.INFO)
 
-# Get arguments from envrionment variables
-model_dir = os.environ.get('MODEL_DIR')
-device = os.environ.get('DEVICE', 'cpu')
-use_trt = os.environ.get('USE_TRT', False)
-
-# Prepare model, download from hub or use local dir
-if model_dir is None:
-    model_dir = fd.download_model(name='ppyoloe_crn_l_300e_coco')
+# Configurations
+model_dir = 'ppyoloe_crn_l_300e_coco'
+device = 'cpu'
+use_trt = False
 
+# Prepare model
 model_file = os.path.join(model_dir, "model.pdmodel")
 params_file = os.path.join(model_dir, "model.pdiparams")
 config_file = os.path.join(model_dir, "infer_cfg.yml")
@@ -33,7 +31,7 @@ model_instance = fd.vision.detection.PPYOLOE(
     runtime_option=option)
 
 # Create server, setup REST API
-app = fd.serving.SimpleServer()
+app = SimpleServer()
 app.register(
     task_name="fd/ppyoloe",
     model_handler=fd.serving.handler.VisionModelHandler,