put enum_selectbox in a controls folder

Author: Mike Prosser

src/nipanel/__init__.py

@@ -3,7 +3,7 @@
 from importlib.metadata import version
 
 from nipanel._panel import Panel
-from nipanel._streamlit_components import enum_selectbox
+from nipanel.controls._enum_selectbox import enum_selectbox
 from nipanel._streamlit_panel import StreamlitPanel
 from nipanel._streamlit_panel_initializer import create_panel, get_panel_accessor
 from nipanel._streamlit_panel_value_accessor import StreamlitPanelValueAccessor

src/nipanel/_streamlit_components.py renamed to src/nipanel/controls/_enum_selectbox.py

@@ -1,4 +1,4 @@
-"""Streamlit UI components for NI Panel."""
+"""A selectbox that allows selecting an Enum value."""
 
 from enum import Enum
 from typing import Any, Callable, TypeVar