[Backend] Add YOLOv5、PPYOLOE and PP-Liteseg for RV1126 (PaddlePaddle#647)

* add yolov5 and ppyoloe for rk1126

* update code, rename rk1126 to rv1126

* add PP-Liteseg

* update lite lib

* updade doc for PPYOLOE

* update doc

* fix docs

* fix doc and examples

* update code

* uodate doc

* update doc

Co-authored-by: Jason <[email protected]>

Author: yeliang2258

README_CN.md

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 <div id="fastdeploy-quick-start-python"></div>
 
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 <summary><b>Python SDK快速开始（点开查看详情）</b></summary><div>
 
 #### 快速安装
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 <div id="fastdeploy-quick-start-cpp"></div>
 
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 <summary><b>C++ SDK快速开始（点开查看详情）</b></summary><div>