Add Streamlit component (#678)

* add streamlit template

* rename MyComponent to SandDance

* add streamlit to monorepo

* add sanddance ref

* ignore python eggs

* add package-lock

* add dev setup

* initial sanddance working version

* pass dataframe

* mandatory dataframe

* cleanup

* sync w backend

* delete package-lock for now, restore after main

* use types

* handle theme

* delete package-lock

* add event output

* add copyright header

* add copyright header

* Revert "delete package-lock for now, restore after main"

This reverts commit a728a67.

* delete bootstrap css

* sync package-lock

* remove test

* better descriptions