Update streamlit app config

[oceans404]

Update streamlit app config

• use nada build --mir-json to get input and output types and parties
• make input secret storage optional / allow computation-time secrets to speed up demos
• create demo Streamlit apps
  • streamlit_demo_apps/app_addition.py
  • streamlit_demo_apps/app_list_scan_linear.py
  • streamlit_demo_apps/app_multiplication.py
  • streamlit_demo_apps/app_voting.py

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