Merge pull request 'Implement base missing values strategies' (#3) from feature/missing-values into main

Reviewed-on: https://codefirst.iut.uca.fr/git/clement.freville2/miner/pulls/3
Reviewed-by: Bastien OLLIER <bastien.ollier@noreply.codefirst.iut.uca.fr>

frontend/pages/normalization.py

@@ -0,0 +1,32 @@
+import streamlit as st
+from normstrategy import MVStrategy, ScalingStrategy
+
+if "data" in st.session_state:
+    data = st.session_state.original_data
+    st.session_state.original_data = data.copy()
+
+    for column, series in data.items():
+        col1, col2 = st.columns(2)
+        missing_count = series.isna().sum()
+        choices = MVStrategy.list_available(data, series)
+        option = col1.selectbox(
+            f"Missing values of {column} ({missing_count})",
+            choices,
+            index=1,
+            key=f"mv-{column}",
+        )
+        # Always re-get the series to avoid reusing an invalidated series pointer
+        data = option.apply(data, column, data[column])
+
+        choices = ScalingStrategy.list_available(data, series)
+        option = col2.selectbox(
+            "Scaling",
+            choices,
+            key=f"scaling-{column}",
+        )
+        data = option.apply(data, column, data[column])
+
+    st.write(data)
+    st.session_state.data = data
+else:
+    st.error("file not loaded")