0.2.2: feat: add streamlit tooltips from SQLObjects

feat: return submitted state

Because we did not have access to the submitted state, manual control
flow was complicated. For instance, creating an object from an
st.experimental_dialog was impossible.

This can still be improved, but for now it already makes things more
manageable.

in the future, st_update_select_form and st_delete_select_form as well
as st_crud_tabs should return a boolean with the submit status, but it
is not strictly necessary for now because they internally call st.rerun
anyway.

feat: add streamlit tooltips from SQLObjects

The doc arg can be passed to the Column objects, and will be displayed
as an helper tooltip on streamlit selectors.

more info on doc: https://docs.sqlalchemy.org/en/13/core/metadata.html#sqlalchemy.schema.Column.params.doc