[serving] Prototype2 PSD & SkyReplacement with Streamlit and FastAPI

[omocomo]

What is this PR?

효석님께서 올려주신 #17 을 포함한 #20 에 대한 PR입니다.

Changes

• serving/fastapi/app
• SkyReplacement

To reviewers

1. requirements

   pip install -r requirements.txt  (in app/streamlit, SkyReplacement)
   pip install uvicorn
   pip install fastapi
   pip install streamlit==1.7
   pip install python-multipart
   pip install click==8.0.4

2. 17 checkpoint/epoch_34.pth

3. sky image path 수정
4. 실행 : serving/fastapi에서 make -j 2 run_app

[omocomo]

1. Streamlit 처음 화면
2. Dehazing, 이어서 Segmentation 동작
3. Sky Replacement
4. 정상 동작 시